Jack Comparison 2-crop.jpeg

Photo By/Credit

Daniel Spencer/USFWS

Media Usage Rights/License
Public Domain
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One of these males is not like the other one. "Jack" coho (top fish) only spend approximately 6 months feeding in salt water compared to 18 months in the ocean by a typical male coho. Jack coho make up roughly 5% of the population (varies between years) and are important genetic conduits between brood years.
Subject tags
Anadromous fish
Fisheries management