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Short-Term Stress Response of Juvenile Rainbow Trout Subjected to Two Different Rearing Densities

Open Journal of Animal Sciences 2023年第1期13卷 126-136页

作者： jaid freestone Jill M. Voorhees Nathan Huysman Eric Krebs Michael E. Barnes South Dakota Game Fish and Parks McNenny State Fish Hatchery Spearfish USA

Juvenile rainbow trout Oncorhynchus mykiss were subjected to one of four treatments in a two-by-two experimental design: 1) fed at a density of 1.8 g/m3, 2) Fasted at 1.8 g/m3, 3) fed at 30.1 g/m3, and 4) fasted at 30.1 g/m3. Blood glucose and hematocrit were measured at 4, 6, 48, 168, and 336 hours after placement in one of the two rearing densities, with relative fin lengths and organosomatic indices recorded at 336 hours. Glucose levels over time were not significantly different among the density and feeding treatments. Hematocrit levels over time were also not significantly different. Total lengths, weight, hepatosomatic index, viscerosomatic index, and any of the relative fin lengths were not significantly different between the high and low densities. However, the hepatosomatic index was significantly greater in the fed fish compared to those fasted. The splenosomatic index was significantly greater in the higher density treatment. These results likely indicate no short-term stress response to the higher rearing density used in this short-term experiment and no interaction between starvation and density-related stressors.

关键词： Rainbow Trout Density Feeding Glucose Hematocrit

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