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Survivor salmon that withstand drought and ocean warming provide a lifeline for California Chinook

November 2, 2021 — In drought years and when marine heat waves warm the Pacific Ocean, late-migrating juvenile spring-run Chinook salmon of California’s Central Valley are the ultimate survivors. They are among the few salmon that survive in those difficult years and return to spawning rivers to keep their populations alive, according to a study published October 28 in Nature Climate Change.

The trouble is that this late-migrating behavior hangs on only in a few rivers where water temperatures remain cool enough for the fish to survive the summer. Today, this habitat is primarily found above barrier dams. Those fish that spend a year in their home streams as juveniles leave in the fall. They arrive in the ocean larger and more likely to survive their one to three years at sea.

Researchers led by first author Flora Cordoleani, associate project scientist with the Institute of Marine Sciences at UC Santa Cruz and NOAA Fisheries, based their findings on an analysis of the ear bones of salmon, called otoliths. These bones incorporate the distinctive isotope ratios of different Central Valley Rivers and the ocean as they grow sequential layers.

Read the full story at PHYS.org

 

Climate change challenges the survival of fish across the world

September 18, 2017 — Climate change will force many amphibians, mammals and birds to move to cooler areas outside their normal ranges, provided they can find space and a clear trajectory among our urban developments and growing cities.

But what are the chances for fish to survive as climate change continues to warm waters around the world?

University of Washington researchers are tackling this question in the first analysis of how vulnerable the world’s freshwater and marine fishes are to climate change. Their paper, appearing online Sept. 11 in Nature Climate Change, used physiological data to predict how nearly 3,000 fish species living in oceans and rivers will respond to warming water temperatures in different regions.

“Climate change is happening. We need tools to try to identify areas that are going to be the most at risk and try to develop plans to conserve these areas,” said lead author Lise Comte, a postdoctoral researcher in the UW’s School of Aquatic and Fishery Sciences. “It’s important to look at the organisms themselves as we cannot just assume they will all be equally sensitive to these changes.”

The researchers compiled data from lab experiments involving nearly 500 fish species, conducted over the past 80 years by researchers around the world. These standardized experiments measure the highest temperatures fish are able to tolerate before they die. This analysis is the first time these disparate data from lab experiments have been combined and translated to predict how fish will respond in the wild.

Read the full story at Science Daily

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