Every salmon farm features "drop outs," growth-stunted fish that float lifelessly at the surface of the pond. New research suggests these fish are severely depressed, as scientists measured significantly higher levels of cortisol, a stress-response hormone, in the drop out salmon.

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Every salmon farm features "drop outs," growth-stunted fish that float lifelessly at the surface of the pond. New research suggests these fish are severely depressed, as scientists measured significantly higher levels of cortisol, a stress-response hormone, in the drop out salmon.