Category Archives: Salmon

Could we ever reverse the trend of shrinking Chinook salmon?

Much has been said about the decline of Puget Sound Chinook salmon. Often the discussion focuses on how to increase the salmon population, but I believe a good case can be made for increasing the size of these once-mighty “kings.”

Chinook salmon // Photo: NOAA Fisheries

There are plenty of reasons why we should strive for larger Chinook, not the least of which is the pure joy of seeing — and perhaps catching — a giant salmon. But I’m also thinking about our endangered Southern Resident killer whales, which don’t seem to find Puget Sound very hospitable anymore. As we know, the whales favor Chinook over any other food.

While it might take more energy for a killer whale to chase down a large Chinook versus a smaller one, the payoff in nutrition and energy far outweighs the expenditure, according to Jacques White of Long Live the Kings, who has been thinking about the size issue for some time.

In terms of competition, a giant returning Chinook might be difficult for a harbor seal to handle, and that could give the orcas a special advantage. Still, we are learning that harbor seals create problems for the Chinook population by eating millions of tiny smolts migrating to the ocean before they get a chance to grow up.

Perhaps the major reason that Chinook have declined in size is the troll fishing fleet off the coast of Alaska and Northern Canada, Jacques told me. It is almost simple math. It takes six, seven or eight years to grow the really large Chinook in the ocean. Today’s fishing fleet goes out into the middle of the Chinook-rearing areas up north. The longer the fishing boats stay there, the more likely it is that they will catch a fish that could have grown into a really big one.

Years ago, the fishing boats did not travel so far out to sea, Jacques said. There was no need to travel far when plentiful runs of salmon came right into the shore and swam up the rivers.

“In the old days,” he said, “you didn’t have people risking their necks off Alaska trying to catch fish in all kinds of weather and seas.”

In additional to the trollers, plenty of sport fishermen have taken the opportunity to catch and take home nice trophy fish, putting extra pressure on the biggest members of the fish population. Fishing derbies, past and present, challenged people to catch the biggest Chinook.

Long Live the Kings, a conservation group, once held fishing derbies, Jacques noted. But, after giving it some thought, everyone realized that the effort was counterproductive. “Long Live the Kings is now out of the derby business,” he said.

Gillnets, once common in Puget Sound, entrap fish by snagging their gills. Gillnets tend not to catch the truly giant salmon, because of the mesh size, but they do catch the larger salmon. Often only the smaller ones make it through to spawn — and that breeds another generation of small fish.

Fishing is not the only factor that tends to favor the survival of small fish, but it tends to be a big factor, according to Tom Quinn, a University of Washington professor of aquatic and fishery sciences. The issue is complicated, and every salmon run has its own characteristics, he said.

Hatcheries, dams and habitat alterations all tend to favor fish that can compete and survive under new conditions, and often those conditions work better for smaller fish. Changes in the food web may create a nutritional deficit for some salmon stocks, and competition at sea with large numbers of hatchery fish may be a factor. Check out the study in the journal Plos One by researchers for the Alaska Department of Fish and Game.

With the removal of two dams on the Elwha River, I’m hoping that experts can make sure that the conditions will be right for larger fish — if they can survive to make it home.

Quinn, along with doctoral student Michael Tillotson, recently published a paper showing how fishing seasons alone can alter the genetic makeup of a population along with the behavior of individual fish.

Although these characteristics are not necessarily related to the size of fish, it directly affects the fitness of the population. When people are fishing on wild stocks during open season, a fish has the best chance of survival if it shows up before the fishing season begins or after the fishing season is over. But that is not nature’s way.

Through evolution, the greatest number of fish tend to come back when environmental conditions are optimal for migration, spawning and smolt survival. If fishing seasons are timed for the peak of the run, that will reduce the percentage of fish taking advantage of the best conditions. Over time, the population gets skewed, as more fish come back during times when conditions are less than optimal.

The result is likely a lower survival rate for the overall population. The real crunch could come in the future as a result of climate change. If temperatures or streamflows become more severe, the fish may be in a no-win situation: If they show up at the most optimal time, they are more likely to get caught. if they come early or late, the environment could kill them or ruin their chances of successful spawning.

“We are reducing the ability of fish to find good environmental conditions,” said Michael Tillotson in a UW news release about the new paper. “We’re perhaps also reducing the ability of fish to adapt to climate change.”

Certain behaviors are bred into wild fish over many generations, and some traits are connected to their timing. Whether they feed aggressively or passively can affect their survival. Some salmon will wait for rain; others will wait for the right streamflow or temperature. Some smolts will stay in freshwater for extended periods; others will move quickly to saltwater. It’s not a great idea when fishing seasons, rather than environmental conditions, dictate fish behavior.

The move to mark-selective fishing — which involves removing the adipose fin of all hatchery fish before they are released — can help solve some problems for wild fish, Tom told me. Under selective fishing rules, fishers are allowed to keep the hatchery fish with a missing fin, but they must release the wild ones that still have all their fins. Some of the wild fish die from injury, but most of them survive, he said.

The key to the problem is a better understanding of the genetic makeup of the individual stocks while increasing the effort to maintain a high-level of genetic diversity. That’s an insurance policy that allows the fish to survive changing conditions.

The genes for giant Chinook have not been lost entirely, as I pointed out in Water Ways on Nov. 25. If we want to have larger Chinook, we must protect the individual Chinook that are larger. That could mean reduced ocean fishing, selective fishing for hatchery populations, and requirements to release fish larger than a certain size. Perhaps it would even be possible to selectively breed larger Chinook in a hatchery for a limited time to increase the size of the fish.

It won’t be easy, because these notions involve messing with billions of dollars in the fishing industry, not to mention complicated international relations. I will save discussions about the Pacific Salmon Treaty for another day. I will just say that this treaty is supposed to be between the U.S. and Canada. But negotiations involve tradeoffs among Washington, Canada and Alaska. Even the Endangered Species Act can’t always protect wild Puget Sound Chinook from being caught in Alaska, with the ultimate outcome that fewer fish make it home to spawn.

Remembering Dan O’Neill, who focused on things as they are

I was pleased to see the tribute story about Dan O’Neill written by Arla Shephard Bull, a regular contributing reporter for the Kitsap Sun.

Dan O’Neill
Photo: Hood Canal Salmon Enhancement Group

Dan, who played a key role in Puget Sound restoration, died in October at age 81. A celebration of his life is scheduled for Saturday from 11 a.m. to 1 p.m. at the Salmon Center in Belfair.

Dan was a longtime board member for the Hood Canal Salmon Enhancement Group based at the Salmon Center. He also served on the Washington State Transportation Commission and was a member of the Leadership Council, the governing body of the Puget Sound Partnership.

I thought Mendy Harlow, executive director of the enhancement group, described the Dan I knew in Arla’s story: “He was really focused on the facts, the science and the truth, which was something I appreciated in him as an individual, but also as a board member,” Mendy said. “He was someone who looked at the reality and not at dreams.”

I don’t remember Dan ever saying anything flashy, but I could always count on him for an honest assessment of various situations. He looked at all sides of an issue. His comments were thoughtful and down to earth.

His unique role on both the Transportation Commission and Leadership Council put him in a good position to address some serious environmental issues. We talked about stormwater runoff from highways and salmon-blocking culverts. He was downright practical about these matters, even when funding measures inexplicably fell into legislative cracks.

“The Legislature right now is dealing with all kinds of issues,” Dan told me in the midst of the culvert lawsuit pitting tribes against the state. “From a transportation standpoint, revenues are down. Gas taxes aren’t producing as much revenues, because people are driving less or using more efficient cars or whatever.”

On the Leadership Council, Dan was always looking for ways to help the public understand the issues better. He once told me that he learned from my stories about the environment, which was nice to hear.

During this time, Dan served on the board of The Greenbrier Companies, a publicly traded railroad car leasing and manufacturing company. He was also a founder of and investor in PowerTech Group, Inc., a business security software company. Sheida Sahandy, executive director of the Partnership, said she appreciated his business sense.

“Dan’s unique perspective from the business community enabled the Leadership Council and the Partnership to make more balanced and broadly informed choices about Puget Sound recovery,” Sheida said in a written statement. “He spoke eloquently on behalf of business interests, but he also kept protection and recovery of Puget Sound at the top of his priority list.”

Dan’s obituary can be found in the Kitsap Sun.

What would it take to restore the legendary Chinook salmon?

Giant Chinook salmon of 50 pounds or more have not yet faded into legend, as operators of a salmon hatchery in Central British Columbia, Canada, can tell you.

Ted Walkus, a hereditary chief of the Wuikinuxv First Nation, holds a Chinook salmon caught this year for the Percy Walkus Hatchery on the Wannock River in Central British Columbia.
Photo: Percy Walkus Hatchery

The annual spawning effort at the Percy Walkus Hatchery on the Wannock River involves catching Chinook as they move upstream rather than waiting for them to arrive at the hatchery. This year, fishing crews brought home a remarkably large fish that has lived long and prospered. The progeny of this fish will be returned to the river from the hatchery to continue the succession of large Chinook.

These big fish compare to the massive Chinook that once made their way up the Elwha River and other major salmon streams of Puget Sound. Knowing that these big fish still exist provides hope that we might someday see such large salmon on the Elwha, following the recent removal of two dams and ongoing habitat restoration.

Large, powerful Chinook are suited to large, powerful streams. Big chinook can fight their way through swifter currents, jump up larger waterfalls and protect their eggs by laying deeper redds. Experts aren’t sure that the conditions are right for large Chinook to return to the Elwha, but many are hopeful. I explored this idea in a story I wrote for the Kitsap Sun in 2010.

As for the two-year-old Percy Walkus Hatchery, big fish are not uncommon in the Wannock River, as you can see in the hatchery’s Facebook photo gallery. By spawning both large and smaller salmon, the hatchery hopes to rebuild the once-plentiful numbers of Chinook in the system. Involved in the project are the Wuikinuxv First Nation along with Canada’s Department of Fisheries and Oceans and others.

Ted Walkus, a hereditary chief of the Wuikinuxv and the man featured in the photo on this page, said the largest fish need to remain part of the gene pool for the hatchery and the river. That’s why volunteers go out into the river to take the brood stock. This year, 47 males and 47 females were spawned to produce more than 300,000 fertilized eggs.

“If you catch a 60-pound salmon and you keep it without breeding, that part of the gene pool eventually gets wiped out,” Walkus was quoted as saying in a CBC News report.

For similar reasons, some anglers choose to release their catch alive, if possible, after getting a photo of their big fish. The hope, of course, is that the fish will continue on and spawn naturally. In the hatchery, the genes will be passed on to more salmon when the progeny are released. Unfortunately, I was unable to quickly locate a facility management plan for the Percy Walkus Hatchery to see if anyone has projected the long-term effects of the hatchery.

Chet Gausta, middle, shows off the big fish he caught off Sekiu in 1964. Chet's younger brother Lloyd, left, and his uncle Carl Knutson were with him on the boat.
Photo courtesy of Poulsbo Historical Society/Nesby

Big fish are genetically inclined to stay at sea five, six or seven years rather than returning after four years. They must avoid being caught in fishing nets and on fishing lines during their migration of up to 1,000 miles or more before making it back home to spawn.

Perhaps you’ve seen historical black-and-white photos of giant Chinook salmon taken near the mouth of the Elwha River. Like the giant Chinook of the Wannock River, some of these fish are nearly as long as a grown man is tall. Catching them with rod and reel must be a thrill of a lifetime.

Some of those giants — or at least their genes — may still be around. The largest Chinook caught and officially weighed in Washington state dates back to 1964. The 70-pound monster was caught off Sekiu by Chester “Chet” Gausta of Poulsbo, who I wrote about upon his death in 2012. See Water Ways, Feb. 3, 2012. His photo is the second on this page.

There’s something to be said for releasing salmon over a certain size, and that goes for commercial fishing as well as sport fishing. Gillnets, for example, target larger fish by using mesh of a certain size, say 5 inches. Smaller fish can get through the nets, spawn in streams and produce the next generation — of smaller fish.

The genetic effects of removing the larger fish along with the effects of taking fish during established fishing seasons artificially “selects” (as Darwin would say) for fish that are smaller and sometimes less fit. Some researchers are using the term “unnatural selection” to describe the long-term effects of fishing pressure. I intend to write more about this soon and also discuss some ideas for better managing the harvest to save the best fish for the future.

Orcas and seals compete for a limited number of chinook salmon

It’s always been troubling to me that the Southern Resident killer whales, which frequent Puget Sound, have struggled to maintain their population, while other fish-eating resident orcas seem to be doing much better.

Killer whale chases a chinook salmon
Photo: John Durbin, Holly Fearnbach, Lance Barrett-Lennard

Now several researchers have analyzed the energy needs of all the seals, sea lions and killer whales that eat chinook salmon along the West Coast, from California to Alaska. The study provides a possible explanation, one that is consistent with what many scientists have suspected all along. Here’s how I explained it in a story written for the Encyclopedia of Puget Sound:

“Puget Sound’s endangered killer whales are waiting at the end of a long food line for a meal of chinook salmon — basically the only food they really want to eat.

“Ahead of them in the line are hundreds of salmon-craving killer whales in Alaska and British Columbia. Even farther ahead are thousands of seals and sea lions that eat young chinook before the fish have a chance to grow to a suitable size for orcas.”

My story contains plenty of numbers to explain what this is all about.

This issue of competition for food is not a simple one to discuss or resolve. But the new paper, published in the journal Scientific Reports, adds an important perspective when trying to answer the question: “Do we have too few salmon or too many marine mammals?”

From a historical viewpoint, the answer must be that we have too few salmon. But from a management perspective, we might have to conclude that the ecosystem is out of balance and that we have been restoring some marine mammal populations faster than we are restoring the salmon that they eat.

In an intriguing study published in March in the journal Nature Ecology & Evolution (PDF 840 kb), a group of West Coast researchers investigated whether it is better to recover populations of prey species first, followed by predator species, or if it is better to recover predator species first, followed by prey species.

Protecting predators first — which is usually the way humans do things — may slow the growth of prey species or even trigger a population decline, the report says. That creates a problem for predators that specialize in that one kind of prey as well as for those that have no access to alternative prey.

It may seem logical to rebuild the prey species first, the authors say. But, with some exceptions, recovering prey species first causes the combined predator and prey populations to peak at high levels that are unsustainable in the overall ecosystem.

“In the real world,” the paper states, “transient dynamics like these that result from eruptions of prey populations can lead to surprising cascades of ecological interactions and complex but often mismatched management responses.”

The authors conclude that the fastest way to restore depressed populations is through synchronous recovery of predators and prey by carefully rebuilding two or more populations at the same time.

Management tactics may include culling predators even before optimal population numbers are reached. Such actions require careful study, as culling may produce unexpected consequences, according to the report.

Other options include protecting multiple species within protected geographic or marine areas or focusing on single species by protecting select habitats or reducing human exploitation.

For Southern Resident killer whales, the question will be whether populations of other marine mammals — particularly harbor seals in Puget Sound —should be controlled. If so, how would people go about doing that?

One related issue that needs more study is the effect that transient killer whales are having on the Salish Sea population of seals and sea lions. As the Southern Residents spend less time searching for chinook salmon in the inland waterway, the seal-eating transients are being spotted more and more by people along the shores of Puget Sound.

Some studies estimate that the transients need an average of one to two seals each day to maintain their energy needs, although we know these whales also eat smaller sea otters and larger California and Steller sea lions, as well as an occasional gray whale.

Are the transients culling the population of harbor seals in Puget Sound or at least limiting their growth? Even before the transients were showing up frequently, biologists were telling us that the overall harbor seal population appeared to be peaking and perhaps declining.

It would be interesting to create a future-looking computer model that could account for populations of salmon and marine mammals under various scenarios — including possible management actions by humans and the ongoing predation by transient killer whales.

If we want to keep things more natural while helping out the Southern Residents, maybe somebody could come up with a strategy to attract and maintain a healthy population of seal-eating transient orcas within the Salish Sea.

Rains bring chum salmon back to their home streams

Salmon appear to be on the move in several local streams, thanks to the recent rains and increased streamflows. Wetter conditions no doubt triggered some of the migratory fish to head back to their spawning grounds.

A pair of chum salmon make it up Dickerson Creek, a tributary of Chico Creek. // Video: Jack Stanfill

It is still a little early in the season for coho and chum salmon to be fully involved in spawning activity, and there is plenty of time for people to get out and observe their amazing migration.

Salmon-watching is often a hit-or-miss situation, although Chico Creek is usually the best bet. After hearing several reports of chum moving upstream, I went out this afternoon to look in several local streams. Unfortunately, I did not get there before the rains stopped. What I saw in Chico Creek and other streams was fish milling about in deep pools, seemingly in no hurry to move upstream. Additional rains and streamflows are likely to get the fish fired up to move in and upstream more quickly.

Jack Stanfill, who lives on Dickerson Creek, a tributary of Chico Creek, said at least two adult chum reached his property today. Several restoration projects along Dickerson Creek probably helped the fish get upstream earlier than we have seen in previous years.

Jon Oleyar, who monitors the salmon migration for the Suquamish Tribe, told me that chum don’t normally get into Dickerson Creek until two weeks after they get into the upper reaches of Chico Creek. “This might be one of the earliest times ever,” Jon said.

As for other streams, the tribal biologist said he has seen early chum in Curley and Blackjack creeks in South Kitsap.

Viewing suggestions for this weekend:

  • Chico Creek: Chico Salmon Park (Facebook) along with a location just above the culvert under Golf Club Hill Road off Chico Way. Also check out the bridge near the 19th Hole Tavern on Erland Point Road and the access at the end of Kittyhawk Drive.
  • Dickerson Creek: Salmon Haven overlook on Taylor Road, off Northlake Way.
  • Curley Creek: Bridge on Southworth Drive near the intersection with Banner Road.
  • Blackjack Creek: A new bridge at Etta Turner Park between Port Orchard Ford and Westbay Center on Bay Street.
  • Gorst Creek: Otto Jarstad Park on Belfair Valley Road, where a new beaver dam has created a sizable pool of water, The dam may be limiting the migration of coho and perhaps blocking most of the chum.

Note for salmon-watchers: This year’s Kitsap Salmon Tours will be held in two weeks, on Saturday, Nov. 4. This year, the popular event has been expanded to seven locations. For details, go to the Kitsap WSU Extension website.

It appears that the chum coming into streams on the Kitsap Peninsula this year are noticeably larger in size than normal, perhaps in the 10- to 10.5-pound range, Jon Oleyar told me. That exceeds the normal 8- to 10-pound size for chum, he said.

Orca Network reported today that some of our Southern Resident killer whales have been foraging this week off the Kitsap Peninsula as well as in other areas not easily identified because of the dark, stormy weather we have had. Let’s hope the orcas can find enough food to stick around awhile.

On Sunday, a small group of whales from L pod showed up in the San Juan Islands for the first time this year. Normally, these whales — L-54 and her offspring along with males L-84 and L-88 — would be seen numerous times during the summer, but this was a highly unusually year. They were seen this week with J pod, which hasn’t been around much either.

On Monday, reports of orcas near Kingston and Edmonds suggested that the whales had moved south. They were later spotted near Seattle and then again near Kingston on Tuesday, when they headed out of Puget Sound by evening.

It is often said that the orcas will go where the salmon are. They are known to prefer chinook when their favorite fish are available, but they will switch to chum after the chinook run is over. It will be interesting to how much time the whales spend in Central and South Puget Sound, where chum are more plentiful.

The total number of chum salmon predicted this year — including those harvested along the way — is expected to be lower than last year. Still, there is hope that the preseason forecast will be exceeded by the actual return. The total predicted for Central and South Puget Sound is 433,000 chum, with 85 percent returning to streams and 15 percent coming back to hatcheries.

Last year, the total predicted run was 526,000 chum, about 21 percent higher than this year. Typically, the number of chum returning in odd-numbered years is lower than in even-numbered years, other things being equal. That’s because odd-numbered years is when the vast majority of pink salmon spawn, resulting in increased competition and lower survival for the young chum. Smaller numbers of juveniles mean fewer adult chum that return four years later during another odd-numbered year, continuing the cycle.

Most of the difference between last year’s and this year’s chum run can be accounted for in the odd- versus even-numbered years, said Aaron Default of the Washington Department of Fish and Wildlife.

It is too early in the season to update the preseason forecast based on commercial and tribal fishing that has taken place so far, Aaron said. As usual, fishing seasons are likely to be adjusted up or down when more information becomes available. The main goal is to make sure that enough fish make it back to sustain and potentially increase the salmon population.

Facing the possibility of extinction for the killer whales of Puget Sound

Southern Resident killer whales, cherished by many Puget Sound residents, are on a course headed for extinction, and they could enter a death spiral in the not-so-distant future.

It is time that people face this harsh reality, Ken Balcomb told me, as we discussed the latest death among the three pods of orcas. A 2-year-old male orca designated J-52 and known as Sonic died tragically about two weeks ago.

Two-year-old J-52, known as Sonic, swims with his mother J-36, or Alki, on Sept. 15. This may have been the last day Sonic was seen alive.
Photo: Ken Balcomb, Center for Whale Research

The young orca was last seen in emaciated condition, barely surfacing and hanging onto life near the entrance to the Strait of Juan de Fuca on Sept. 15. Ken, director of the Center for Whale Research, said the young whale was attended to by his mother Alki, or J-36, along with a male orca, L-85, known as Mystery — who may have been Sonic’s father, but more about that later.

Extinction, Ken told me, is “very real” — not some ploy to obtain research dollars. The population of endangered Southern Residents has now dropped to 76 — the lowest level since 1984. Most experts agree that a shortage of chinook salmon — the primary prey of the orcas — is the greatest problem facing the whales.

Last week, the Leadership Council — the governing body of the Puget Sound Partnership — discussed what role the partnership should play to “accelerate and amplify efforts” to restore chinook salmon runs and save the orcas. Chinook themselves are listed as a threatened species.

Graph: Center for Biological Diversity

Puget Sound Partnership is charged by the Legislature with coordinating the restoration of Puget Sound, including the recovery of fish and wildlife populations.

The Leadership Council delayed action on a formal resolution (PDF 149 kb) in order to allow its staff time to identify specific actions that could be taken. Although the resolution contains the right language, it is not enough for the council to merely show support for an idea, said Council Chairman Jay Manning.

Sonic was one of the whales born during the much-acclaimed “baby boom” from late 2014 through 2015. With his death, three of the six whales born in J pod during that period have now died. No new calves have been born in any of the Southern Resident pods in nearly a year.

Meanwhile, two orca moms — 23-year-old Polaris (J-28) and 42-year-old Samish (J-14) — died near the end of 2016. Those deaths were followed by the loss of Granny (J-2), the J-pod matriarch said to have lived more than a century. Another death was that of Doublestuf, an 18-year-old male who died last December.

Three orcas were born in L pod during the baby boom, and none of those whales has been reported missing so far.

Ken believes he witnessed the final hours of life for young Sonic, who was lethargic and barely surfacing as the sun set on the evening of Sept. 15. Two adults — Sonic’s mother and Mystery — were the only orcas present, while the rest of J pod foraged about five miles away.

Sonic seen with his mother in June.
Photo: Ken Balcomb, Center for Whale Research

That was the last time anyone saw Sonic, although his mother Alki as well as Mystery were back with J pod during the next observation four days later. Ken reported that Alki seemed distressed, as often happens when a mother loses an offspring.

Ken admits that he is speculating when he says that Mystery may have been Sonic’s father. It makes for a good story, but there could be other reasons why the older male stayed with the mother and calf. Still, researchers are engaged in studies that point to the idea that mature killer whales may actually choose a mate rather than engaging in random encounters. I’m looking forward to the upcoming report.

I must admit that this issue of extinction has been creeping up on me, and it’s not something that anyone wants to face. Food is the big issue, and chinook salmon have been in short supply of late. It will be worth watching as the whales forage on chum salmon, as they are known to do in the fall months.

“This population cannot survive without food year-round,” Ken wrote in a news release. “Individuals metabolize their toxic blubber and body fats when they do not get enough to eat to sustain their bodies and their babies. Your diet doctor can advise you about that.

“All indications (population number, foraging spread, days of occurrence in the Salish Sea, body condition, and live birth rate/neonate survival) are pointing toward a predator population that is prey-limited and nonviable,” he added.

The Center for Biological Diversity, which was involved in the initial lawsuit that led to the endangered listing for the whales, is calling upon the NOAA’s National Marine Fisheries Service to move quickly to protect orca habitat along the coasts of Washington, Oregon and California. Currently designated critical habitat is limited to Puget Sound, even though the whales are known to roam widely along the coast.

“The death of another killer whale puts this iconic population on a dangerous path toward extinction,” Catherine Kilduff of CBD said in a news release. “If these whales are going to survive, we need to move quickly. Five years from now, it may be too late.”

How fast the whales will go extinct is hard to determine, experts say, but the current population is headed downward at an alarming rate, no matter how one analyzes the problem.

“I would say we are already in a very dangerous situation,” said Lance Barrett-Lennard, senior marine mammal researcher at the Vancouver Aquarium. “If this trajectory continues and we lose two or three more from deaths or unsuccessful birth, we will be in a real spiral,” he told reporter Richard Watts of the Times Colonist in Victoria, B.C.

A five-year status review (PDF 4.3 mb), completed last December by NMFS, takes into account the number of reproductive males and females among the Southern Residents, the reproductive rates, and the ratio of female to male births (more males are being born). As the population declines, the risk of inbreeding — and even more reproductive problems — can result.

Eric Ward of NOAA, who helped write the status report, said the agency often estimates an extinction risk for endangered populations, but the actual number of Southern Residents is too small to produce a reliable number. Too many things can happen to speed up the race toward extinction, but it is clear that the population will continue to decline unless something changes.

As Ken describes it in simple terms, Southern Resident females should be capable of producing an offspring every three years. With 27 reproductive females, we should be seeing nine new babies each year. In reality, the average female produces one offspring every nine years, which is just three per year for all three pods. That is not enough to keep up with the death rate in recent years. To make things worse, reproductive females have been dying long before their time — and before they can help boost the population.

Experts talk about “quasi-extinction,” a future time when the number of Southern Residents reaches perhaps 30 animals, at which point the population is too small to recover no matter what happens. Some say the population is now on the edge of a death spiral, which may require heroic actions to push the population back onto a recovery course.

As described in the five-year status review, prey shortage is not the only problem confronting the Southern Residents. The animals are known to contain high levels of toxic chemicals, which can affect their immune systems and overall health as well as their reproductive rates. Vessel noise can make it harder for them to find fish to eat. On top of those problems is the constant threat of a major oil spill, which could kill enough orcas to take the population down to a nonviable number.

The graph shows the probability that the Southern Resident population will fall below a given number (N) after 100 years. Falling below 30 animals is considered quasi-extinction. The blue line shows recent conditions. Lines to the left show low chinook abundance, and lines to the right show higher abundance.
Graphic: Lacy report, Raincoast Conservation Foundation

Despite the uncertainties, Robert Lacey of Chicago Zoological Society and his associates calculated in 2015 that under recent conditions the Southern Resident population faces a 9 percent chance of falling to the quasi-extinction level within 100 years. Worsening conditions could send that rate into a tailspin. See report for Raincoast Conservation Foundation.

What I found most informative was how the probability of extinction changes dramatically with food supply. (See the second graph on this page.) A 10 percent decline in chinook salmon raises the quasi-extinction risk from 9 percent to 73 percent, and a 20 percent decline raises the risk to more than 99 percent.

On the other hand, if chinook numbers can be increased by 20 percent, the whales would increase their population at a rate that would ensure the population’s survival, all other things being equal. Two additional lines on the graph represent a gradual decline of chinook as a result of climate change over the next 100 years — a condition that also poses dangerous risks to the orca population.

The close links between food supply and reproductive success are explored in a story I wrote last year for the Encyclopedia of Puget Sound.

At last Wednesday’s Puget Sound Leadership Council meeting, members discussed a letter from the Strait (of Juan de Fuca) Ecosystem Recovery Network (PDF 146 kb) that called on the Puget Sound Partnership to become engaged in salmon recovery efforts outside of Puget Sound — namely the Klamath, Fraser and Columbia/Snake river basins.

“Such collaborative efforts must be done for the benefit of both the SRKW and chinook fish populations, without losing sight of the continuing need to maintain and improve the genetic diversity of these fish populations …” states the letter.

A separate letter from the Puget Sound Salmon Recovery Council (PDF 395 kb) also asks the Puget Sound Partnership to become more engaged in orca recovery. The group is calling on the partnership to support salmon recovery statewide, “relying on each region to identify strategies to restore robust salmon runs.”

Rein Attemann of Washington Environmental Council said salmon on the Columbia and Snake rivers, as well as he Fraser River in British Columbia, are “vitally important” to the recovery of the Southern Resident killer whales, and Puget Sound efforts should be coordinated with other programs.

Jim Waddell, a retired civil engineer with the Army Corps of Engineers, spoke forcefully about the need to save chinook salmon and the Southern Residents, starting by tearing down dams on the Snake River.

“We are out of time,” Waddell said. “The Corps of Engineers have it within their power to begin breaching the dams within months…. The orcas cannot survive without those chinook.”

An environmental impact statement on chinook recovery includes the option of breaching the dams, something that could be pushed forward quickly, he said.

“Breaching the Snake River dams is the only possibility of recovery,” Waddell said. “There is nothing left.”

Stephanie Solien, a member of the Leadership Council, said speaking up for orcas in the fashion proposed is not something the council has done before, but “we do have a responsibility to these amazing animals and to the chinook and to the tribes.”

The council should work out a strategy of action before moving forward, she added, but “we better get to moving on it.”

Puget Sound Partnership may confront net pen controversy

Puget Sound Partnership may take a stand on whether fish farms should be allowed to remain in Puget Sound waters.

The partnership is charged by the Legislature to oversee the restoration of the Puget Sound ecosystem. On Wednesday, the partnership’s governing body, the Puget Sound Leadership Council, received an update on last month’s collapse of a net pen containing 305,000 Atlantic salmon near Cypress Island in northern Puget Sound.

About two-thirds of the escaped fish have been accounted for so far, with about 146,000 found dead or alive in the damaged net pen and about 55,000 caught by fishermen. (All but about 5,000 of those were caught by tribal fishers in Puget Sound.)

This video, taken by a private party and released by state agencies, shows the collapse of the Cypress Island net pens on Aug. 19

About 100,000 Atlantic salmon apparently escaped and have not been caught by people, although most of those probably were eaten by predators, experts say. Officials continue their efforts to figure out where any remaining fish have gone, specifically any that swam up into the streams, according to Amy Windrope of the Washington Department of Fish and Wildlife.

The Atlantic salmon, an exotic species in Puget Sound, don’t appear to be eating anything, let alone young native salmon, Windrope said, and there is not much concern that they will breed with native fish. The greatest concern is that they might somehow disrupt the spawning behavior of native salmon, whose populations are already stressed by adverse conditions in both marine and fresh water.

The Atlantic salmon appeared to be healthy and free of parasites at the time of the release, she said, but they became less and less healthy as starvation set in.

In addition to Windrope, the presentation to the Leadership Council included reports from representatives of the state Department of Natural Resources, which leases the seabed where the pens are located, and the Department of Ecology, which issues permits under water-quality laws.

Puget Sound tribes are about to release a position statement opposing salmon farms in Puget Sound, said Russell Hepfer, a member of the Leadership Council and vice chairman of the Lower Elwha Klallam Tribal Council. He did not elaborate, except to say that the non-native fish don’t belong here.

According to Windrope, the tribes see Atlantic salmon as weeds in the garden of Puget Sound. Such cultural viewpoints should be taken into account in the overall discussion, she added.

Soon after the Cypress Island net pen collapse, Washington Gov. Jay Inslee and Public Lands Commissioner Hilary Franz issued a moratorium blocking further net pen approvals until an investigation is complete.

Maradel Gale, a resident of Bainbridge Island, addressed the Leadership Council at Wednesday’s meeting near Port Gamble, saying the Bainbridge Island City Council has effectively limited the expansion of net pens at the south end of the island and would like to get rid of net pens altogether.

She said Cooke Aquaculture, which owns all the net pens at four locations in Puget Sound, receives the benefits of using the public waterways and placing the ecosystem in peril while taking very little risk upon itself.

Dennis McLerran, a member of the Leadership Council who has worked for various environmental agencies, said Washington state law has long provided a preference for aquaculture over many other shoreline uses. Like it or not, he said, those preference are “baked into state policies” that direct state agencies to support aquaculture, including salmon farms.

“That is where the Leadership Council should have some discussion,” McLerran said. “Are those preferences in state law appropriate?”

The state of Alaska prohibits salmon farms, while California’s complex regulations allow them only under specific conditions related to water supplies, said Kessina Lee of Ecology.

Jay Manning, chairman of the Leadership Council and former director of the Washington Department of Ecology, said the Legislature will no doubt want to hear a complete report on the Cypress Island net-pen collapse, and he urged the agency officials to be fully prepared to answer questions from lawmakers.

“You will be asked, when the Legislature comes back, ‘How big a deal is this?’” Manning said, noting that he has heard from some people that it is a very big deal, while others say it is nothing at all.

Windrope noted that native salmon populations are already struggling, “and this is one more injury to the salmon.” But since the escaped Atlantic salmon don’t appear to be competing for food, the question comes down to whether they are affecting native fish in other ways. That question is not fully answered, she said.

“For DNR, this is a very big concern,” said Dennis Clark, who helps manage aquatic leases for the agency. “We have a contract with a multinational company, and they failed to adhere to it.”

DNR serves as the landlord for the Puget Sound net pen operations, he said. The aquatic leases run out at various times, from 2022 to 2025, and the agency is taking a closer look at the net pen structures to see what should be done from both a scientific and landlord perspective. Commissioner Franz is taking a special interest, he added.

“We are trying very hard to learn from this (incident),” Clark said, “and we understand that we may need to devote more resources.”

Rich Doenges of Ecology said the Atlantic salmon that got away are considered a “pollutant” under Washington state law. While no long-term effects have been seen following previous escapes of Atlantic salmon, there is some risk to native salmon. The key is to quantify that risk and determine if it is low enough to make the operations worthwhile. If necessary, he said, compliance orders can be issued and state water-quality permits can be amended to require additional safety measures.

Seattle attorney Doug Steding, representing Cooke Aquaculture, said he wanted to convey “sorrow and regret” from the company over the potential impacts of the escape.

“We want to make right with respect to this terrible accident,” he said, adding that the company is committed to working with investigators into the cause of the escape and finding ways to make sure that it never happens again.

Steding noted that Cooke recently acquired the Puget Sound facilities and did not own the Cypress Island net pens when the fish were placed in them. The company should have shared more information with the public about plans to upgrade the facilities, he said.

“You have an important task sorting through the difficult science and integrating with the values of the people of Washington,” Steding told the Leadership Council, adding that Cooke hopes to remain a part of the discussion.

Southern Resident orcas make it back to Puget Sound in good condition

Killer whale observers were gleefully surprised this week when all three pods of Southern Resident orcas came into the Salish Sea — and all were in reasonably good shape.

K-25, a 26-year-old male orca named Scoter, is seen breaching Monday when a large group of Southern Residents arrived in the Salish Sea.
Photo: Ken Balcomb, Center for Whale Research

Remember, these same whales have been missing from Puget Sound for practically the entire summer — a period when they traditionally remain in and around the San Juan Islands while feasting on salmon. This summer has generated concern among those who understand the ways of whales. Some observers have feared that the orcas, wherever they were, might not be getting enough to eat (Water Ways, Aug. 18).

That fear has largely disappeared, said Ken Balcomb, director of the Center for Whale Research who has been studying these animals for more than 40 years.

“There were no fat whales among them,” Ken told me, “but they had to be finding something (to eat) out there.”

Ken’s only concern was with a couple of young calves, 2 and 3 years old. They remain small for their age. (Ken calls them “runts.”) They probably have not received complete nutrition, given that the whales don’t seem to be finding chinook salmon in their regular feeding grounds.

“We know that there is a problem with juvenile and infant survival,” Ken said, but there is hope that these calves will make it.

Before they entered the Salish Sea this week, the three pods must have met up in the Strait of Juan de Fuca if not the Pacific Ocean, as all were together when they were spotted Monday morning near the south end of Vancouver Island by whale observer Mark Malleson.

The Center for Whale Research sent out two boats. Ken and Gail Richard boarded the Shachi and met up with the leading group of orcas just east of Secretary Island. Ahead of the pack was J-19, a female orca named Shachi, who appears to have taken over the leadership role from Granny, or J-2, the elder matriarch that led J pod for decades before her death.

Read Ken’s full report of the encounter on the Center for Whale Research website. For some observations about Granny, check out these Water Ways reports:

On Monday, J-pod whales were clustered in their family groups along the Vancouver Island shoreline, while those in K pod were farther offshore and trailing J pod, according to Ken’s report. Not all of L pod was there, but those in the area were spending time in their family groups, or matrilines, even farther behind and farther offshore.

Some of the whales were sprinting into tidal waters to catch salmon close to shore on the incoming tide of Monday afternoon, Ken said.

“The salmon tend to move into the Salish Sea with the flood tides and hang back in nearshore eddies and bays in ebb tides,” Ken wrote in his report, “so the whales foraging and traveling east suggested that there were at last sufficient numbers of salmon to bring them all of the way in.”

As the whales captured fish, their social interactions with each other increased, at least among the family groups, Ken told me.

Meanwhile, the second boat from the Center for Whale Research, Orcinus with Dave Ellifrit and Melisa Pinnow aboard, met up with the whales just west of Discovery Island east of Victoria. After a breakaway by the Shachi crew to transfer photos from Mark Mallinson, both boats continued to follow the whales until sunset. At dusk, the entourage ended up right in front of the center’s shoreline base on San Juan Island.

Spurred on by this rare (for this year) sighting of all three pods, the five photographers in the three boats shot more than 3,500 photos in one day, Ken reported. Some of the best portraits and ID photos are shown with notes of the encounter. Other photos and expressions of excitement can be seen on Orca Network’s Whale Sighting Report.

The researchers reported that all the whales in J and K pods were present — except for K-13, who had been reported missing (Water Ways, Aug. 18). Of the 35 orcas in L pod, 22 were seen on Monday. The missing whales are not a concern, Ken said, because the 13 not spotted were all members of matrilines that apparently were somewhere else.

“It is not unprecedented for L pod matrilines to be very widely separated at times — e.g., part of the pod in Puget Sound while others are off California!” Ken noted in his report. “All of the whales today appeared to be frisky and in good condition, though we clearly have a few runts in the youngest cohort of whales – probably having been in perinatal nutritional distress due to recent poor salmon years in the Salish Sea.”

The next day, Tuesday, the whales were spread out in small groups in Georgia Strait on the Canadian side of the border. Yesterday, they traveled back through Haro Strait in the San Juan Islands, then headed on west toward the Pacific Ocean. It will be interesting to see what happens next, as these fish-eating orcas continue to hunt for chinook salmon and then switch this fall to chum salmon when the chinook grow scarce.

The Center for Whale Research’s efforts to keep track of the Southern Residents is funded in part by the federal government, but the center’s other work involving orcas depends on donations and memberships. Go to “Take Action for Orcas” for information.

Collapsed fish pens could shift the debate over Atlantic salmon farms

UPDATE: Aug. 30

Democratic members of Washington state’s congressional delegation are calling on federal agencies to take immediate steps to minimize damage from the net pen collapse and release of Atlantic salmon near Cypress Island. Read the news release.

“Pacific salmon are central to our economy, our culture, and our environment in the Pacific Northwest and are a critical part of marine and estuarine ecosystems in Washington state,” the letter states. “Most concerning is the threat farmed Atlantic salmon pose to the wild Pacific salmon populations stocks in Puget Sound. Farmed salmon tend to be larger and could outcompete wild salmon for critical resources, such as prey and preferred habitat, which is important for spawning. Tribes, fishermen, and state agencies are working to respond to the escapement, but the scale of the release calls for immediate and direct federal response….”

Meanwhile, a public hearing about the expansion of the Port Angeles net pen operation has been cancelled at the request of the owner, Cooke Aquaculture. Read the letter from Steve Gray (PDF 155 kb), Clallam County’s deputy planning director.
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The recent collapse of salmon pens near the San Juan Islands could become a turning point in the war against salmon farming that is being waged by environmental groups in Puget Sound.

Yesterday, Gov. Jay Inslee and Commissioner of Public Lands Hillary Franz announced a moratorium on new state leases or permits for any fish farms using Atlantic salmon. The moratorium will remain in place until state officials can fully review the escape of more than 300,000 Atlantic salmon from net pens near Cypress Island, according to a joint announcement (PDF 107 kb).

The video, by Glenn Farley and Travis Pittman of KING 5 News, was posted Friday.

The owner of the pens, Cooke Aquaculture, has applications pending to move and expand its net pen operation near Port Angeles to an area 1.8 miles offshore in the Strait of Juan de Fuca.

Cooke, a family-owned company, acquired all of the salmon farms in Puget Sound from Icycle Seafoods last year. The deal was touted as a way to infuse capital and modernize operations on the West Coast.

“The deal will enhance the family’s investments in both the wild fishery and the aquaculture sectors, making them leaders in the U.S. salmon farming sector and a major player in the Alaskan salmon fishery,” said a news release about the acquisition. See the story by Cliff White in “SeafoodSource.”

Perhaps the company did not have time to upgrade its facilities to reduce the risk of the net pens collapsing at Cypress Island and other farming operations. In a news release (PDF 251 kb), Cooke said it had applied for permits to update its Cypress Island site. Still, this latest incident cannot instill confidence in the company nor the salmon farming industry as a whole.

In fact, one could argue that that the company’s extensive “Fish Escape Prevention Plan” (PDF 1.4 mb) and Operations Plan (2.4 mb) should have raised red flags for the company. Cooke cited unusual tides and currents as contributing factors in the pens’ collapse, despite the fact that these tide levels are seen several times each year and stronger currents can be anticipated at times.

Cooke proudly proclaims its commitment to the environment on the company’s home page. But shooting itself in the foot on Cypress Island will leave a bad feeling for many Puget Sound residents. For environmental groups, this event will provide ammunition in their effort to stop the expansion of net pens in Puget Sound and phase out their use entirely.

It is often pointed out that Washington is the only state on the West Coast that allows salmon farming. (See “Our Sound, Our Salmon.” Meanwhile, a serious debate over the pros and cons of industrial-scale aquaculture goes on and on in British Columbia, where more than 100 salmon farms are well established. Take a look at reporter Gordon Hoekstra’s story in the Vancouver Sun.

The war on salmon farms has been waging for years on both sides of the border. While battles ought to be won or lost based on credible information, I’ve seen facts distorted to fit political goals on both sides of the argument.

Now the Cypress Island incident will raise the profile of the debate in Washington state. Let’s hope that the investigation called for by Gov. Inslee and Commissioner Franz will lead to findings that go beyond the question of why the net pens collapsed and look at the overall risks and benefits of keeping these salmon farms around.

Kurt Beardslee, executive director of Wild Fish Conservancy, told me in an email that he is working today to sample 50,000 pounds of Atlantic salmon that escaped from the Cypress Island net pens. Experts will be looking for viruses, parasites and stomach contents.

I believe the information about stomach contents will be particularly valuable, because of concerns that the escaped fish could be consuming wild salmonids — including young chinook and steelhead, both of which are listed as threatened species. Obviously, we don’t have enough out-migrating chinook and steelhead as it is. (You may wish to review my recent story about salmon recovery in the Encyclopedia of Puget Sound.)

Meanwhile, Wild Fish Conservancy, a staunch opponent of salmon farming, has filed notice that it intends to sue Cooke Aquaculture for violations of the Clean Water Act.

“The Conservancy is deeply disheartened by Cooke Aquaculture’s glaring negligence, negligence which has led to an environmental disaster of epic proportion,” states a news release (PDF 115 kb) from the organization. “The needless escape of up to 305,000 Atlantic salmon into Puget Sound represents a dire threat to already imperiled wild fish populations, beloved marine mammal species, and the fragile Puget Sound ecosystem at large, and Wild Fish Conservancy fears impacts to these critical aspects of our region will be felt for years to come.”

The 60-day “letter of intent” (PDF 1.9 mb) from Wild Fish Conservancy outlines a number of alleged violations of federal law resulting from the release of Atlantic salmon and the management of debris. The group says it will seek monetary penalties of up to $52,000 a day, as provided by law, and “injunctive relief to prevent further violations.”

When I asked Kurt what he thought the lawsuit could accomplish, he wrote, “Simply speaking, I believe It’s in the best interest of our sound, our salmon and future generations to pursue all legal avenues to quickly remove Atlantic salmon net pens from Washington’s waters.”

The group — which is part of Our Sound, Our Salmon — is planning an on-the-water protest off the south end of Bainbridge Island on Sept. 16. See “Flotilla: saying no to Atlantic salmon net pens.”

In response to the Cypress Island incident, an “incident command” structure has been set up by the Washington state departments of Natural Resources, Fish and Wildlife, and Ecology, along with the Office of the Governor and Emergency Management Division. The idea is to share information and make joint decisions about the cleanup operation.

“The release of net pen-raised Atlantic salmon into Washington’s waters has created an emergency situation that has state agencies working together to protect the health of our salmon…,” Gov. Inslee said in a statement. “Tribes and others who fish Washington waters deserve a comprehensive response to this incident, including answers to what happened and assurances that it won’t happen again.

“I believe the company must do everything it can to stop any additional escapes and to recover as many fish as possible, including adequate compensation for those working to remove Atlantic salmon from our waters,” he added.

A new website called “Cypress Island Atlantic Salmon Pen Break” will be the distribution point for public information — including “situation updates” from Cook Aquaculture, “Next steps” from DNR, minutes from agency conferences, news releases and other documents.

The Clallam County Hearing Examiner will hold a hearing on Sept. 7 regarding the proposed relocation and expansion of the Port Angeles net pens. Many documents related to that application and Cooke Aquaculture operations can be found on the website titled Clallam County Online Permit System. Click on the permit number for American Gold Seafoods.

Lights could be creating problems for salmon, seabirds and more

Bright lights that affect the behavior of birds, fish and other wildlife are emerging as a significant environmental concern.

Endangered Hawaiian Petrel
Photo: B. Zaun, U.S. Fish and Wildlife Service

Yesterday, for example, two environmental groups filed a lawsuit against the Hawai’i Department of Transportation for bright lights the agency controls at piers and airports. The groups say three species of seabirds on the Endangered Species List have been circling the lights until the birds drop from exhaustion, and some birds have died.

Meanwhile, in Lake Washington and the nearby Cedar River in King County, there is evidence that threatened chinook salmon are at greater risk from predators because of lights on the two floating bridges as well as industrial facilities in Renton.

In Florida, researchers have discovered that female turtles avoid coming ashore to lay their eggs where bright lights are present, and in Virginia salamanders have delayed their feeding efforts in the glare of lights.

The lawsuit in Hawaii was filed by lawyers for Earthjustice out of concern for three species of seabirds: Newell’s shearwater, a threatened species, and Hawaiian petrels and band-rumped storm petrels, both endangered species.

The Hawai’I Department of Transportation has failed to protect the birds, as required by the Endangered Species Act, according to the lawsuit filed on behalf of the Hui Ho‘omalu i Ka ‘Āina, Conservation Council and the Center for Biodiversity. Because the lighting is injuring and killing listed species, the state agency must obtain an incidental take permit and initiate actions to minimize harm, the lawsuit says. For details, see the complaint for declaratory and injunctive relief (PDF 1.4 mb).

Lights at airports and harbor facilities have been documented as the greatest source of injury and death to the seabirds, which migrate at night and become disoriented by the artificial lights, the complaint asserts. Some birds crash into buildings, while others end up on the ground where they may be struck by vehicles or eaten by predators.

Since the 1990s, the Newell’s shearwaters have declined by 94 percent and the Hawaiian petrels on the island of Kauai have dropped by 78 percent.

“Our ancestors depended on the ‘a‘o (Newell’s shearwater), ‘ua‘u (Hawaiian petrel) and ‘akē‘akē (band-rumped storm-petrel) to help locate schools of fish, to navigate from island to island and to know when the weather is changing,” Kauai fisherman Jeff Chandler was quoted as saying in a news release from Earthjustice.

According to the news release, the Department of Transportation dropped out of talks with state and federal wildlife agencies that are developing a habitat conservation plan to protect the seabirds. After Earthjustice filed a notice of intent to sue, the agency rejoined the talks.

“That’s a good start, but talk alone will do nothing to save these rare and important animals from extinction,” said Earthjustice attorney David Henkin. “It’s long past time for the department to take action, not only on Kauai, but everywhere in the state that its operations illegally kill seabirds.”

Lake Washington chinook

As for the lights on and around Lake Washington, I have not heard of any proposed lawsuits to protect the threatened Puget Sound chinook, but concerns continue to simmer.

Lights on the Highway 520 bridge
Photo: Washington Dept. of Transportation

Jason Mulvihill-Kuntz, salmon recovery manager for the Lake Washington/Cedar/Sammamish Watershed, told me that the next regional chapter of the chinook recovery plan will call for further study into the effects of lights on juvenile chinook migrating down the Cedar River and through Lake Washington.

“The technical folks have identified light as a potential emerging issue,” Jason said. “We don’t have a good handle on what the impacts are.”

Lights on Lake Washington may be creating a double whammy for young chinook, Jason said. First, the lights attract the fish, which slow down their migration to Puget Sound. Second, the lights keep them visible to predators at night, so the fish may be eaten 24 hours a day.

“Juvenile salmon don’t have a nighttime respite,” Jason said. “At least that’s the hypothesis.”

Nonnative predatory fish include bass, walleye and northern pike. Native predators include cutthroat trout and pike minnow. Predatory birds include the western grebe and great blue heron.

An updated chinook recovery plan for the Lake Washington region is under review and could be finalized this fall. Predation is getting some additional attention this time around, Jason said, and the issue of lights is something that needs more study.

Experts at the U.S. Fish and Wildlife Service have identified potential concerns with lighting along Lake Washington in a series of studies going back more than 10 years. It still isn’t clear, however, how much the known problems with predators are exacerbated by bright lights. That’s why more studies are needed.

Following complaints from residents of Laurelhurst near the Highway 520 bridge, the Washington Department of Transportation reduced the amount of illumination coming off that bridge, and further investigation is underway. Check out the King-5 News report below.

Other species

With regard to other species, lights are known to have a variety of effects. Reporter Sharon Guynup outlined the problems for birds, turtles, amphibians, mammals and even insects in a revealing story in National Geographic News, April 17, 2003.

A group of British researchers from the University of Exeter compiled a list of the known effects of light on various species while considering the role of artificial lighting. See “The ecological impacts of nighttime light pollution; a mechanistic appraisal” in Biological Reviews.