Why Are Millions Of Fish Washing Up Dead In Pacific Ocean?

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Millions of fish continue to wash up dead in the Pacific Northwest, allegedly due to unusually hot and dry weather near the Pacific ocean. 

The Washington State Department have confirmed they’ve lost “1.5 million juvenile fish this year due to drought conditions at our hatcheries,” and remarked, “This is unlike anything we’ve seen for some time.”

Usatoday.com reports:

Sockeye salmon losses in the Columbia River due to the heat are in the hundreds of thousands, said Jeff Fryer, senior fishery scientist with the river’s Inter-Tribal Fish Commission. The fish were returning from the ocean to spawn when the “unprecedented” warm water killed them, he said.

Water temperatures in the Columbia River — part of which runs along the border of Oregon and Washington  — reached the low 70s shortly after July 4, something that doesn’t usually happen until August, if at all, Fryer said.

High temperatures — coupled with the low water levels — can be lethal to fish, according to the Oregon Department of Fish and Wildlife. With no end to the drought in sight, there could be additional fish die-offs, said Rod French, a fish biologist with the department.

Dead and distressed sockeye salmon found earlier this month in the Deschutes River in Oregon likely came from the Columbia River and were bound for other locations before they swam into the Deschutes in search of cooler water, the department said. Early pathology results suggest they died from columnaris, a bacterial infection typically associated with high water temperatures and/or low levels of dissolved oxygen.

In Idaho, “it’s a tough year for all (migrating) fish, including sockeye,” Mike Peterson, Idaho Fish and Game’s senior sockeye research biologist, said in a statement.

Recreational fishermen in the region are also feeling the heat: Warm stream temperatures due to low flows and hot weather cause fish trauma, disease, and deaths, which has prompted the closing of streams to all fishing along the Washington Cascades, Richard Heim of the National Oceanic and Atmospheric Administration wrote in this week’s U.S. Drought Monitor report.

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