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- W2164469779 abstract "Abstract Ahstract.—Cutthroat trout of the Bear Lake Bonneville strain, Oncorhynchus clarki utah, were used in two separate density experiments. In the first, fish were reared for 212 d in outdoor raceways at four densities; fish were allowed to grow into their final rearing density and were fed 7 d/week. Final rearing densities averaged 768, 1,597, 2,073, and 2,998 fish/m3, and corresponding density indices (DI = fish weight, Ib/[fish length, in ×water volume, ft3]) were 0,40, 0.90, 1.10, and 1,46. In experiment 2, crowding screens were adjusted monthly, and fish were fed 5 d/week: final rearing densities were 338, 739, and 1,634 fish/m3 (DIs of 0.19, 0.39, 0.75). Feed conversion and mortality did not significantly differ among densities for either experiment, Final mean weights did not differ among the four densities of experiment 1, but mean total length was significantly longer in fish reared at the lower densities. In experiment 2, final mean weight was significantly reduced in the highest density and specific growth rates for all densities were lower than in experiment 1. Frequencies of agonistic behaviors did not differ among densities in experiment 2. Hemoglobin, total white blood cell (WBC) counts, differential WBC counts, and hepatosomatic indices did not differ among densities in either experiment. Red blood cell (RBC) counts and the splenosomatic index (SI) did not differ among densities of experiment 1. However, in experiment 2, the RBC count was higher at the lowest density than at the highest, and the SI was significantly higher at the highest density than the lowest. Condition factor, plasma protein, hematocrit, and relative dorsal fin length differences among densities were observed, but were inconsistent over time, Adverse effects of high density on mesenteric fat levels and pectoral fin condition were observed in experiment 2. Saltwater challenge tests resulted in greater mortality for fish from high densities. The data indicated that rearing cutthroat trout at a DI of 0.75 or higher (about 1,600 fish/m3) may compromise fish health when densities are adjusted monthly and fish are fed 5 d/week; the data also indicated that even lower densities are needed for maximum growth." @default.
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- W2164469779 date "1997-07-01" @default.
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- W2164469779 title "Effects of Rearing Density upon Cutthroat Trout Hematology, Hatchery Performance, Fin Erosion, and General Health and Condition" @default.
- W2164469779 doi "https://doi.org/10.1577/1548-8640(1997)059<0173:eorduc>2.3.co;2" @default.
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