Welsh researchers discover salmon can smell danger - Need to Read - News - WalesOnline

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No juts salmon, many other fish and organisms can detect chemical cues.

BlueOne

It now seems to be generally accepted that salmon find their way back to their spawning grounds through their acute sense of smell. Just as each major city of the world has its own set of identifiable odors, each stream apparently has a unique set.

An illustration of just how acute is the salmon's ability to distinguish between different scents is given by C. Herb Williams writing in the November 1978 issue of Pacific Search. He cites experiments by Canadian scientists showing that salmon will slow or stop their migrations when certain human smells are present. A solution of one part human skin in 80 billion parts water dumped into a river caused salmon to stop migration for as long as a half hour.

BK

Not really a surprise.
Is well documented that prey species can detect their predator by smell.
Best one i have seen recently was the orca butchering a great white shark!


What is amazing about this factual clip, is that all the great whites in the area legged it 6000 miles to the other side of the ocean, just cos the orca nailed one of them!
Is also said that female human pheromones turn on the salmon too!
whereas male hormones chase them!
Hence the fact that women often catch bigger and more salmon!
regards
bert
bert

yes they do

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stop buying bottled water we have,nt got enuff to fish in now so stop it get the water companies to do there job and clean the water every where!!!!