Tag Archives: Gray whale migration

Gray whale deaths lead to declaration of ‘unusual mortality event’

As more gray whales wash up dead on beaches in Puget Sound and along the West Coast, NOAA Fisheries has declared an “unusual mortality event” to mobilize additional research into what is killing these massive marine mammals.

Aerial images, such as this one off Central California, help biologists assess the condition of gray whales as part of a declared “unusual mortality event.”
Photo: Southwest Fisheries Science Center and SR3 under federal permits NMFS 19091 and MBNMS 2017-8.

About 70 gray whales have been found dead so far this year along the shorelines of California, Oregon, Washington and Alaska, with another 73 in Mexico and five in Canada. That’s the most since the year 2000, when more than 100 gray whales were stranded along the U.S. West Coast, triggering a previous unusual mortality event, or UME.

Many of the dead whales have shown signs of emaciation, suggesting that they failed to find enough food in the Arctic last summer, a time when they need to build up enough energy reserves to make it through the winter. Each year, the Eastern North Pacific gray whales travel from their feeding grounds in Alaska to their over-wintering areas in Mexico. As they return north at this time of year, they could be exhausting the remainder of their fat reserves, experts say.

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