Chinook salmon muscle biopsy

Detailed Description
Chinook salmon restrained in a cradle after non-lethal muscle biopsy sample collection for heat stress assessment at a subsistence fish wheel in the Yukon River during July 2017. The muscle biopsy location looks like one of the black spots on the back of the fish.
Sources/Usage
Public Domain.
Photo by Shannon Waters-Dynes, U.S. Geological Survey