养殖方式、光照强度对哲罗鱼稚鱼生长与存活的影响

采用生态学方法,研究了养殖方式、光照强度对哲罗鱼稚鱼生长与存活的影响。结果表明:在养殖方式实验中,哲罗鱼稚鱼体长、体质量均以室内静水组为最高,室内流水组其次,室外流水组最低。存活率以室内流水组为最高,室外流水组次之,室内静水组最低。统计分析表明养殖方式对哲罗鱼稚鱼终末体长、体质量、特定生长率、体长生长参数以及体长、体质量变异系数的影响均达到极显著水平(P0.01)。在光照实验中,哲罗鱼稚鱼的存活率、体长、体质量及特定生长率、体长生长参数均随光照强度的增加而增加,说明在哲罗鱼稚鱼室内培育阶段,适当地增加部分光照有利于其存活、摄食与生长。本研究结果为哲罗鱼高效养殖提供了科学依据。

EFFECTS OF WATER FLOW AND LIGHTING ON JUVENILE HUCHO TAIMEN

Indoor and outdoor culture schemes in lentic and running water at different light intensities were tested for understanding the effect of them on survival and growth of juvenile Hucho taimen. The result shows that the body length and weight in indoor lentic-water culture was the highest, followed by indoor and outdoor running-water culture. However, the survival rate of indoor running-water group was the highest, followed by outdoor running-water group and indoor lentic-water group in turn. The overall growth performance, including final body length, body weight, specific growth rate, growth indices, variation coefficients of body length and body weight was significantly affected by culture scheme (P<0.01). In terms of light intensity, the survival rate, final body length and body weight, specific growth rate and body length growth indices increased with the increase in light intensity, indicating that at indoor stage of juvenile Hucho taimen, increasing proper light was more conducive to the survival and foraging. This study may provide a scientific basis for the efficient culture of Hucho taimen.