Abstract
Steelhead Salmo gairdneri, 50–60 mm in total length, were tested for dye retention, indication of stress, and survival after they were marked either with compressed air, by immersion in a hyperosmotic solution, or with an acrylic paint brush. All fish sprayed with compressed air retained dye throughout the 90-d study. Dye in the paint brush group lasted up to 27 d on all fish, but dye was fully retained less than 3 d on hyperosmotically marked fish. No mortalities were observed in any of the three experimental groups. Fish marked by the compressed air method exhibited a 7-h interruption in their feeding; fish in the other two groups showed no interruption of feeding.
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