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<br />. <br /> <br />. <br /> <br />. <br /> <br />REFERENCE NUMBER: <br /> <br />CITATION: <br /> <br />004 <br /> <br />t1amman, R.I. 1982b. Spawning and culture of humpback chub. <br />Progressive Fish-Culturist 44(4):213-216 <br /> <br />SPECIES AND LIFE STAGE: <br /> <br />TOPICS: <br /> <br />KEYWORDS: <br /> <br />HB, HB_EGG, HB_LAR. liB_ADULT <br /> <br />Production, Culture Techniques, Temperature, Life History <br /> <br />SPAWNING, BROOD STOCK, TEMPERATURE <br /> <br />SUMMARY: Humpback chub were spawned and cultured at Willow Beach National FISh Hatchery. <br />Seventeen wild females ovulated after injection with 4 mg acelOne~ried carp pituitary per <br />kilogram of fish. Eight females were stripped manually, whereas the remaining nine injected <br />females spawned naturally in a trout raceway. Mean fecundity of the eight females was 2,523. <br /> <br />Incubation periods ranged from 102 to 146 b at water temperatures of 21-22 C, 115-160 h at <br />19-20 C, 167-266 h at 16-17 C, and 304 to 475 hat 12-13 C. Egg survival rates were 79% at <br />21-22 C, 84% at 19-20 C, 62% at 16-17 C, and 12% at 12-13 C. Survival rates of swim-up fiy <br />were 99% at 21-22 C, 95% at 19-20 C, 91% at 16-17 C, and 15% at 12-13 C. The length of fiy <br />placed in raceways had doubled by 21 to 28 days, and fingerlings had attained a range of 36.9 <br />to 47.5 DUD and 586.5 to 887.4 mg by day 56 after hatching. <br /> <br />A-4 <br />