Sentinel Cage

A biologist examines a sentinel cage in the Green River. Carp were placed in cages like these. They were one of the best means available to determine the toxicity of the water from rotenone during the Green River Rehabilitation.

Photo by Rex Gary Schmidt. Courtesy of National Conservation Training Center. #4438

A biologist examines a sentinel cage in the Green River. Carp were placed in cages like these. They were one of the best means available to determine the toxicity of the water from rotenone during the Green River Rehabilitation.  Photo by Rex Gary Schmidt. Courtesy of National Conservation Training Center. #4438
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