Mark-Recapture and Fish Monitoring Activities in the Little Colorado River in Grand Canyon from 2000-2022.pdf

Since 2000, AZFWCO has conducted studies in the lower 13.57 river kilometers (rkm) of the Little Colorado River (LCR) to estimate abundance and track trends in abundance of the Humpback Chub (Gila cypha), and to monitor other fishes. This report documents Mark-Recapture and Fish monitoring studies in a 22-year period from 2000-2022.

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Little Colorado River confluence
The Arizona Fish and Wildlife Conservation Office – or AZFWCO as we are more commonly known – is part of the U.S. Fish and Wildlife Service’s Fish and Aquatic Conservation Program. Established in eastern Arizona in 1956 as a fishery assistance office, AZFWCO has expanded to three stations, located...
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Juvenile Northern Pike in aquarium at Gavins Point National Fish Hatchery, South Dakota
The Fish and Aquatic Conservation program leads aquatic conservation efforts for the U.S. Fish and Wildlife Service. We are committed to tackling the nation’s highest priority aquatic conservation and recreational challenges to conserve, restore, and enhance fisheries for future generations.
Close up of a California condor. Its pink featherless head contrasts with its black feathers.
We provide national leadership in the recovery and conservation of our nation's imperiled plant and animal species, working with experts in the scientific community to identify species on the verge of extinction and to build the road to recovery to bring them back. We work with a range of public...
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