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在半循环水养殖系统中研究了养殖密度对体重为50～100 g的高体革鯻苗种的影响。试验设置3个密度组:低密度组100尾/m3(5 kg/m3)、中密度组260尾/m3(13 kg/m3)和高密度组360尾/m3(18 kg/m3)。研究表明:各密度组中试验鱼的生长表现出了明显的差异,生长效率、特定生长率和日增重随着养殖密度的升高而明显降低;大小变动系数和饵料系数随着养殖密度的升高而明显增加。对试验鱼的生理指标分析表明,试验初期,密度对试验鱼血清中的皮质醇、补体C3、谷草转氨酶(ALT)和谷丙转氨酶(AST)有显著影响;试验结束时,3个密度组试验鱼血清中的皮质醇、谷草转氨酶和谷丙转氨酶没有明显差异。综合对检测指标的结果分析,认为本试验条件下,体重50～100 g的高体革鯻幼鱼的比较适宜的养殖密度是260尾/m3。研究亮点:(1)高体革鯻是近年来逐渐引起关注的优良淡水养殖品种,比较适合高密度集约化养殖,但关于其适宜养殖密度的研究尚未见报道。研究高体革鯻幼鱼的适宜养殖密度,希望为生产提供理论基础。(2)不仅分析了常规的生长指标和生理指标,将部分生产指标一并纳入分析,作为评价养殖密度适宜性的标准。
The effect of stocking density on the high-body leatherfurger seedlings with the body weight of 50 ~ 100 g was studied in a semi-recirculating aquaculture system. The experiment set three density groups: low density group 100 / m3 (5 kg / m3), medium density group 260 / m3 (13 kg / m3) and high density group 360 / m3 (18 kg / m3). The results showed that the growth of test fish in each density group showed obvious difference. The growth efficiency, specific growth rate and daily gain were significantly decreased with the increase of stocking density. The coefficient of variation of size and feed ration varied with the stocking density Increased significantly increased. Physiological analysis of the test fish showed that at the beginning of the experiment, the density had a significant effect on the cortisol, complement C3, aspartate aminotransferase (ALT) and alanine aminotransferase (AST) in the test fish serum. At the end of the experiment, the three density test Fish serum cortisol, aspartate aminotransferase and alanine aminotransferase no significant difference. Based on the analysis of the test results, it is concluded that the optimum culture density for the body of juvenile Leucocephal lagenoidea with body weight of 50 ~ 100 g is 260 / m3 under the test conditions. Research highlights: (1) The high body leather 鯻 is gradually attracting attention in recent years, an excellent freshwater aquaculture species, more suitable for intensive intensive breeding, but its suitable breeding density has not been reported. Study on the suitable culture density of juvenile fish in high body leather, hope to provide theoretical basis for production. (2) Not only the conventional growth indexes and physiological indexes were analyzed, but also some production indexes were included in the analysis as the standard to evaluate the suitability of breeding density.