Copper Effects on Salmon Influenced by Salinity
“Nietzsche was wrong: what doesn’t kill you doesn’t necessarily make you stronger. Sublethal doses of toxic copper can reduce a salmon’s chances of survival, but new research suggests impacts may be different in saltier water.
A decade of research by David Baldwin of NOAA’s North west Fisheries Science Center and other biologists has shown that in some situations, very low levels of dissolved copper interfere with a salmon’s ability to detect smells. This can be a matter of life or death: salmon rely on their olfac tory sense to avoid predators, locate prey, and home in on their natal streams when they return from the ocean to spawn. … ”
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