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Conservationists mourn loss of sick orca

Orcas
The orca known as J50 was seen with her family on Sept. 3, but is no longer part of the group. (Center for Whale Research Photo / Dave Ellifrit)

The emaciated and ailing killer whale known as J50 or Scarlet has disappeared from her family group, and experts presume that she’s dead. Nevertheless, the National Oceanic and Atmospheric Administration and its partners are continuing the effort to find her, dead or alive.

“We have alerted the West Coast Marine Mammal Stranding Network, which is a tremendous resource in such situations,” NOAA said in its Sept. 13 update. “Airlines flying in and out of the San Juan Islands are also on the lookout.”

NOAA said the hotline for stranding reports is 1-866-767-6114.

The last confirmed sighting of J50 was reported on Sept. 7 by NOAA, the SeaDoc Society and other observers. J50’s presumed loss comes after weeks of efforts to get her medicine and extra food. Experts were never able to diagnose exactly what was ailing the whale.

The 3-year-old orca’s plight captured worldwide attention over the past couple of months. So did the case of J35, also called Tahlequah, another orca from the same pod who was seen carrying her dead calf for 17 days this summer.

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Chinook salmon are shrinking – but why?

Chinook salmon
A Chinook salmon frequents Oregon’s McKenzie River. (Morgan Bond Photo via UW)

King salmon, the big fish that are famous in Alaska and the Pacific Northwest, are shrinking — not only in numbers, but in size as well.

A study published today in the journal Fish and Fisheries has found that the largest and oldest Chinook salmon (also known as king salmon or Oncorhynchus tshawytscha) have mostly disappeared along the West Coast.

“Chinook are known for being the largest Pacific salmon, and they are highly valued because they are so large,” lead author Jan Ohlberger, a research scientist in the UW’s School of Aquatic and Fishery Sciences, said in a news release. “The largest fish are disappearing, and that affects subsistence and recreational fisheries that target these individuals.”

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Killer whale woes linked to salmon shortage

Orca mother and calf
A southern resident killer whale calf accompanies its mother in 2004. (NOAA Photo)

What’s killing the killer whales? After following the whales and analyzing their poop for years, scientists say the Pacific Northwest’s population is dwindling primarily due to a chronic lack of Chinook salmon.

The killer whales, also known as orcas, aren’t dying of starvation. Rather, the scientists say the stress of not getting enough to eat is causing orca pregnancies to fail.

Other factors, such as marine pollutants and disruptive ship traffic, contribute to the whales’ woes as well. But in a paper being published in the June 29 issue of the journal PLOS ONE, the researchers say the data point most directly to nutritional stress.

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