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<br />. <br /> <br />. <br /> <br />. <br /> <br />REFERENCE NUMBER: <br /> <br />CITATION: <br /> <br />003 <br /> <br />Hamman. R.L. 1989. Survival of Colorado squawfish cultured in <br />eanhen ponds. Progressive FlSh-Culturist 51(1):27-29. <br /> <br />SPECIES AND LIFE STAGE: <br /> <br />TOPICS: <br /> <br />KEYWORDS: <br /> <br />SUMMARY: <br /> <br />CS, CS_LAR. CS_JUV, CS_ADU <br /> <br />Production, Culture techniques, Diet, ute History <br /> <br />SPAWNING, REARING, DIET, POND~ FECUNDITY, CLAM <br />SHRIMP <br /> <br />Swim-up fry and fingerling Colorado squawfish were reared in eanhen ponds. Ponds averaged <br />3 feet in depth and 0.89-0.98 acre (fry) and 0.98-1.08 acre (fingerling). Fry were stocked <br />105,316 - 137,438 per acre in each of three ponds. Fry at stocking averaged 95,340 -104,420 <br />fish per pound. Fmgerlings were stocked 52,978 - 55,424 per acre in each of two ponds. At <br />stocking fingerlings ranged from 980 - 1088 fish per pound. Fry were feed commercial trout <br />feed at an undetermined rate as a supplement to natural plankton. Fingerlings were (eed :# 1 <br />and #2 granules at 5.0% of body weight daily from time of stocking. Fry survival at 50 days <br />averaged 328%. Fmgerling survival at 88 days averaged 92.7%. Twenty-five females from the <br />1974 Dexter National FISh Hatchery stock were induced to spawn by injection of acetone-dried <br />carp pituitary. Average weight was 4.7 lb, and mean fecundity was 82,576 eggs. <br /> <br />Ponds used for swim-up fry were fenilized 10 days prior to stocking with alfalfa pellets (300 <br />lblacre) and superphosphate (50 lb/acre). Rotifers and cladoceraus were present in ponds. <br />Clam shrimp Cyzicus sp. occurred in ponds creating excessive turbidity. This crustacean was <br />conuolled with Masoten (trichlorfon) at 0.25 ppm three days prior to stocking of fry. This <br />affected plankton populations and contributed to low percent survival of these fish. <br /> <br />A-3 <br />