Releasing captive-bred Atlantic salmon into the ocean, a long-standing practice to boost stocks for commercial fishing, reduces the rate at which ...
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It has long been assumed that wild and captive-born fish were"ecologically equivalent," but the new research shows otherwise. "That means that when you have a healthy, self-sustaining population of salmon, there is no level at which it is safe to stock fish," he added. Unlike farmed salmons, which spend their entire lives in aquaculture facilities, the captive-bred fish are released into the wild as juveniles, or smolts.
"Because we can track the genetic pedigree of the fish over generations, we can count the number of offspring that a given fish has had," O'Sullivan explained. That means the loss of genetic diversity with each breeding event, especially as the fish selected were themselves born in hatcheries.
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