School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Locked Bag 1370, Launceston, 7250, Australia.
Fish Physiol Biochem. 2010 Sep;36(3):445-450. doi: 10.1007/s10695-009-9314-x. Epub 2009 Mar 15.
A 64-day growth experiment was conducted in which two groups of Atlantic salmon parr were grown under either control conditions or subjected to a weekly crowding stressor. Subjecting fish to the stressor resulted in a 7.7% reduction in wet weight after 29 days, which was maintained at 7.9% by day 64. This reduction in weight was reflected in a 44% reduction in specific growth rate and 38% increase in feed conversion ratio over the first 29 days of the experiment. Elevation in plasma cortisol was observed in crowded fish on days 1, 29 and 64. Similarly, on days 1 and 29 an increase in both plasma glucose and lactate was detected. On day 64, however, no differences in plasma glucose and lactate were observed, with the magnitude of the cortisol response also significantly reduced. Overall, the relatively moderate impact on growth performance and reduction in magnitude of measured stress parameters at the end of the experiment suggests possible habituation to the applied stressor.
进行了一项为期 64 天的生长实验，两组大西洋鲑幼鱼在对照条件下或每周承受拥挤胁迫下生长。将鱼类置于胁迫下，29 天后湿重减少了 7.7%，64 天后仍维持在 7.9%。在实验的前 29 天，体重的减少反映在特定生长率降低了 44%，饲料转化率增加了 38%。在拥挤的鱼身上观察到血浆皮质醇在第 1、29 和 64 天升高。同样，在第 1 和 29 天，检测到血浆葡萄糖和乳酸都增加了。然而，在第 64 天，血浆葡萄糖和乳酸没有差异，皮质醇反应的幅度也显著降低。总的来说，在实验结束时对生长性能的相对适度的影响以及测量的应激参数幅度的减少表明，鱼类可能对施加的应激源产生了适应。
