Like many people, I was shocked and saddened by the death of J-32, an 18-year-old female orca who had offered an avenue of hope for the recovery of the endangered killer whale population in Puget Sound.
We now know from yesterday’s necropsy, that Rhapsody, as she is called, was pregnant at the time of her death.
“Yes, she was pregnant, near-term, 80 percent or plus,” Ken Balcomb told me last light after participating in the examination of the body near Courtenay, B.C.
The actual cause of death is not yet certain, but it is likely that the fetus died in the uterus, resulting in a necrotic condition that eventually broke down the mother’s tissues, according to Ken, founder of the Center for Whale Research. There were no signs of trauma that would suggest injury of any kind, he added.
Dr. Stephen Raverty, a veterinary pathologist in charge of the necropsy, removed J-32’s uterus with the intact fetus inside. Dr. Rafferty told me that he plans to take images of the fetus in utero tomorrow before continuing the examination. He said he would be unable to provide any information until he receives approval from his client, the Canadian Department of Fisheries and Oceans.
As in other post-mortem examinations of killer whales, experts will examine tissues, blood and body fluids in multiple ways to gauge the general health of the animal as well as the cause of death. The Southern Resident pods — J, K and L — are known to carry some of the highest loads of toxic chemicals of any marine mammals in the world. The whales may also undergo nutritional stress because of a shortage of their primary prey, chinook salmon.
The last sighting of the animal was Nov. 29. Her body was found floating near Courtenay on Thursday, Dec. 4. She was a “remarkably small” killer whale, about 15 feet long, Ken said. Females normally grow to between 16 and 23 feet.
Rhapsody was born in 1996. Her mother, J-20 or Ewok, died when she was 2 years old. The young whale was then raised by her Aunt, J-22 or Oreo. Rhapsody is survived by her aunt and two cousins. (See Orca Network’s news release about the death.)
At age 18, she was at the beginning of her reproductive life, with a potential to add several babies to the dwindling population of Southern Residents, now at 77 animals. J pod is down to 24 orcas, with only a few reproductive females at this time.
Ken Balcomb said he hopes Saturday’s necropsy will reveal whether J-32 had ever been pregnant before, since killer whales typically become fertile around age 12 and often give birth by age 15. Her mother was 13 when she was born, Ken noted.
When the ovaries expel an egg, it leaves a little white scar tissue behind. If the egg is fertilized and grows, the scar tissue is notably larger, Ken explained.
An average female gives birth every five years, Ken said. That rate should be adding three or four calves to the Southern Resident population each year.
“Three years ago, I predicted that they should be having 19 babies by now,” Ken said.
Instead, the population is declining, with no surviving calves born last year or this year. A baby born to L-86 in September of this year was reporting missing a little more than a month later.
Rhapsody was the third adult to die this year. Also missing and presumed dead are L-53, a 37-year-old female known as Lulu, and L-100, a 13-year-old male known as Indigo.
Howard Garrett and Susan Berta of Orca Network may have spoken for many of us with this comment: “We cannot express how tragic this loss is for this struggling, precariously small, family of resident orcas of the Salish Sea.”