Population Estimates for Humpback Chub (Gila Cypha) and Roundtail Chub (Gila Robusta) in Westwater Canyon, Colorado River, Utah 1998-2000
Citation
Julie A Jackson, and J Michael Hudson, Population Estimates for Humpback Chub (Gila Cypha) and Roundtail Chub (Gila Robusta) in Westwater Canyon, Colorado River, Utah 1998-2000: .
Summary
Humpback chub (Gila cypha) are listed under the Endangered Species Act of 1973, as amended. In accordance with recovery goals finalized in 2002, a population estimate was completed for adult humpback chub in Westwater Canyon on the Colorado River. This population estimate was conducted from 1998 to 2000 with the objectives of obtaining population estimates for humpback chub and roundtail chub in Westwater Canyon. Sampling occurred during September and October throughout the three years of the study. Three passes were conducted annually with approximately one week between passes. The primary method of capture was via trammel netting with supplemental electrofishing on one pass per year. Population estimates were generated from recapture [...]
Summary
Humpback chub (Gila cypha) are listed under the Endangered Species Act of 1973, as amended. In accordance with recovery goals finalized in 2002, a population estimate was completed for adult humpback chub in Westwater Canyon on the Colorado River. This population estimate was conducted from 1998 to 2000 with the objectives of obtaining population estimates for humpback chub and roundtail chub in Westwater Canyon. Sampling occurred during September and October throughout the three years of the study. Three passes were conducted annually with approximately one week between passes. The primary method of capture was via trammel netting with supplemental electrofishing on one pass per year. Population estimates were generated from recapture data using the null estimator (Mo) within Program CAPTURE. Separate estimates were generated for each year of the study.