Warm water leads to thousands of salmon deaths in the Sacramento River

Warm water leads to thousands of salmon deaths in the Sacramento River

Source: Redding Record

1/4/2022

Credit: Steve Martarano

Marking the second time in the past six years, nearly the entire hatch of endangered winter-run chinook salmon were wiped out in 2021 due in part to high water temperatures in the Sacramento River in the Redding area.

Fisheries officials said a vitamin deficiency in adult fish also likely contributed to the deaths of their offspring.

Only about 2.6% of the wild winter-run salmon that hatched in the river survived long enough to make it to Red Bluff, according to a memo from the California Department of Fish and Wildlife.

And then less than half of the fish that made it to Red Bluff also survived to make it out to the San Joaquin Delta. It was one of the worst years on record for winter-run survival, according to the National Marine Fisheries Service.

"Clearly, it was a grim year for winter-run chinook. The temperatures were not favorable in the river, which obviously was a result of the low water (in Lake Shasta) and the high temperatures" in the Sacramento River, said Michael Milstein, a spokesman for the National Marine Fisheries Service.

Even before the past two years of drought, the winter-run were having a rough go of it. The winter-run are an endangered species, and nearly all the fish spawn in the in the river and tributaries in the Redding area.

Sacramento River

Salmon, Chinook

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