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Never. Pacific salmon released in the Atlantic (or was it the other way around?) were touted as an ecological disaster. But they mistook the gravel bottom for their normal food supply, ate rocks until they sank, and all died.

Fish are not master tacticians. More like a bug with fins.

Have a citation for this? Sounds fascinating.

Niece at Thanksgiving - PhD fisheries and policy. I can ask her.

The issue hit the news when it happened: Ecological disaster! Salmon stocks at risk! Then when nothing happened, it wasn't news. So folks still cite this 'disaster' like it still actually happened.

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