A Kenai River king salmon is sampled for age and length information and implanted with an esophageal radio tag. King salmon are captured with gillnets designed to minimize trauma by tangling rather than gilling the fish and are held in a specialized cradle that allow biologists to safely collect scale samples, measure length, and insert a radio tag. Biologists then track the radio-tagged fish with boats, airplanes, and ground stations. When the project is complete, biologists can analyze the collected data to provide an estimate of king salmon abundance.

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