пишут что семга - исключение, и что тихооокеанские виды все гибнут после нереста.

en.wikipedia.org/wiki/Salmon#Life_cycle

Salmon not killed by other means show greatly accelerated deterioration (phenoptosis, or "programmed aging") at the end of their lives. Their bodies rapidly deteriorate right after they spawn as a result of the release of massive amounts of corticosteroids.

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