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Journal of Fisheries and Aquatic Science
Year: 2008  |  Volume: 3  |  Issue: 6  |  Page No.: 366 - 374

The Influence of Feeding Ration on the Acute Stress Response of Beluga (Huso huso)

F. Askarian and A. Kousha    

Abstract: In this study, the effect of 90 days maintenance-feeding period on the acute stress response of 45 one year old beluga, Huso huso, to handling and confinement were determined. The fishes were divided to three treatments including Control, High food ration (H>L) and low food ration (L>H). Fishes were raised on an optimal feeding level of 4% of body weight per day during the experiment. The fishes in High treatment (H>L) was fed 4% of body weight per day for 60 days and food ration was reduced to 1% of body weight per days in the last month of experiment. The fishes in Low treatment (L>H) was fed 1% of body weight per day for 60 days and food ration was suddenly increased to 4% of body weight per days in the last month of experiment. All fishes were sampled at the end of experiment one time before exposure to stress and 3 times including half an hour, 1 and 3 h after stress. The results revealed that food ration had significant effects on the growth rate and food conversion values because fishes fed the high ration performing better than those on a lower level. Prior to the application of the stressor, only plasma levels of triglycerides were lower in fish fed a low food ration at the last month of experiment (H>L). Feeding history Influenced the onset of the stress response with stressor-induced elevations of plasma cortisol, glucose and free fatty acids being higher in fish fed a high ration compared with those fed a low ration prior to sampling (H>L). These results suggest that feeding history through modification of the energy reserves can influence the onset of the acute stress response.

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