Abstract
Abstract During 1981, bonytail chub (Gila elegans) were spawned and cultured at Willow Beach (Arizona) National Fish Hatchery. This species is listed as endangered by the U.S. Fish and Wildlife Service. Five females ovulated 18 to 20 h after intraperitoneal injections of 4 mg acetone-dried carp pituitary per kilogram of body weight. Eggs were manually stripped and artificially fertilized; mean fecundity was 25,090. Incubation periods were 99 to 174 h at water temperatures of 20-21°C, 170 to 269 h at 16-17°C, and 334 to 498 h at 12-13°C. Survival of eggs was 90% at 20-210C, 55% at 16-17°C, and 4% at 12-13°C. At hatching, total length and weight of fry averaged 6.8 mm and 2.8 mg. Survival of swim-up fry was 98% at 20-21°C, 96% at 16-17°C, and 25% at 12-13°C. Fry placed in raceways doubled in length by 28 days, and fingerlings were 42.9 to 54.3 mm in total length and weighed 714.1 to 1,326.8 mg 70 days after hatching.
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