紫黑翼蚌钩介幼虫在不同规格寄主鱼寄生效果及对寄主鱼营养指标的影响

为提高紫黑翼蚌(Potamilus alatus)繁殖效率,探讨寄生对淡水石首鱼(Aplodinotus grunniens)营养指标的影响,实验通过比较钩介幼虫脱落数量,测试了不同规格寄主鱼的寄生效果,分析了寄生对寄主鱼血清生化指标及肌肉中氨基酸、脂肪酸含量的变化。结果显示:大规格组每尾鱼脱落数显著高于小规格组(P<0.05),小规格组每千克寄生鱼平均脱落稚贝数显著高于大规格组(P<0.05);寄生导致肌肉中肌酐显著升高(P<0.05),谷丙转氨酶、谷草转氨酶和乳酸脱氢酶显著降低(P<0.05),血糖、总蛋白、白蛋白、甘油三酯、总胆固醇、高密度脂蛋白和低密度脂蛋白与对照组无显著性差异(P>0.05);寄生组灰分与对照组无显著性差异(P>0.05),寄生组肌肉水分和粗脂肪含量显著高于对照组(P<0.05),粗蛋白显著低于对照组(P<0.05);寄生组天冬氨酸、丙氨酸、谷氨酸、酪氨酸、甘氨酸和精氨酸含量显著低于对照组(P<0.05),非必需氨基酸含量显著低于对照组(P<0.05),其他氨基酸之间无显著性差异(P>0.05)...

THE HOST EFFICIENCY OF DIFFERENT SIZE FOR GLOCHIDIA OF POTAMILUS ALATUS AND IMPACT ON NUTRITIONAL INDEXES OF HOST FISH

In order to improve the reproductive efficiency of pink heelsplitter, Potamilus alatus, and explore the influence of parasitism on nutritive index of freshwater drum, Aplodinotus grunniens, this experiment measured the effect of parasitism of different scales through comparing the amount of glochidium falling from freshwater drum, and analyzed changes of serum biochemical indices of the host, and content of amino acid and fatty acid under stress of parasitism. Results indicated that the amount of glochidium falling from the hosts in group of big freshwater drum is significantly greater than that in group of small freshwater drum (P<0.05), while the average amount of juvenile mollusk falling from the hosts in each kilogram in group of small freshwater drum is much bigger than that in group of big freshwater drum (P<0.05); creatinine in muscles significantly increases under stress of parasitism (P<0.05), and glutamic-pyruvic transaminase, glutamic oxalacetic transaminase and lactic dehydrogenase greatly drop (P<0.05), while blood glucose, total protein, albumin, triglyceride, total cholesterol, high-density lipoprotein and low density lipoprotein barely change comparing with those in the control group (P>0.05); ash content in the experimental group barely differs from that in the control group (P>0.05), and water content and crude fat in muscle in the experimental group are significantly higher than those in the control group (P<0.05), while content of crude protein in experimental group is obviously lower than that in the control group (P<0.05); content of aspartic acid, alanine, glutamic acid, tyrosine, glycine and arginine in the experimental group are greatly lower than those in the control group (P<0.05), and content of non-essential amino acid is notably lower than that in the control group (P<0.05), while the content of other amino acids in two groups are barely different (P>0.05); the content of lauric acid (C12:0) and arachidonic acid (C20:1) in the experimental group are remarkably higher than those in the control group (P<0.05), while there is no other significant difference (P>0.05). Results indicated that small size host fish is more suitable for practical production and parasitism had little influence on the nutritive index of freshwater drum.