Giving Atlantic salmon a headstart back into Lake Ontario

The world’s largest population of freshwater salmon was historically found in Lake Ontario. Loss of spawning habitat, prey species and overfishing contributed to the extinction of the Atlantic salmon locally.

The USGS Tunison Aquatic Laboratory scientists are changing that by raising and releasing over 100,000 Atlantic salmon annually since 2011 into Lake Ontario and tributaries. With improved spawning habitat and restoration of lake herring, preferred prey of salmon, the future looks bright.

Four Seneca Park crew and Zoo staff assisted USGS with marking 8,000 three-inch baby salmon by clipping a vestigial fin, called the adipose fin, from each fish. After administering an anesthetic in the water, the tiny fin is removed with a pair of surgical scissors.

This permanent identification allows fish biologists in the future to distinguish adult stocked from naturally spawned salmon. By restoring native fish species back to Lake Ontario we are returning a natural balance to the food web and ecosystem.

– Dr. Jeff Wyatt, Director of Animal Health and Conservation