光照强度对黄颡鱼生长和生理性能的影响

Effects of light intensity on the growth and physiological performance of Pelteobagrus fulvidraco

为分析光照强度对黄颡鱼生长和生理性能的影响,本研究通过光控实验,探究了光照强度1~8 W/m^(2)范围内黄颡鱼的生长和生理性能。结果显示,黄颡鱼在光强3~6 W/m^(2)范围内的增重率(8.33%~11.78%)和特定增长率最高(0.53~0.74%/d),饵料系数最低(6.42~9.17),黄颡鱼体内的胃蛋白酶、脂肪酶活性升高,消化性能提升,而超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)、碱性磷酸酶(AKP)和酸性磷酸酶(ACP)活性降低,抗氧化、免疫性能受到抑制;受鱼类代谢影响,不同光强条件下养殖水体中的氨氮、溶解氧等水质指标出现差异。研究表明,光照强度3~6 W/m^(2)能够促进黄颡鱼的生长及消化性能。研究结果为黄颡鱼高效养殖提供了理论依据。

Light is one of the primary environmental factor which has an important impact on the growth,develop-ment,metabolism and morphology of fish.In order to analyze the effect of light intensity on the growth and physiological performance of Pelteobagrus fulvidraco,this study recorded the growth and physiological perform-ance of P.fulvidraco within a range o light intensity(1-8 W/m^(2))by light control experiments.According to the res-ults,P.fulvidraco in the groups(light intensity of 3-6 W/m^(2))had highest weight gain rate(8.33%-11.78%),spe-cific growth rate(0.53-0.74%/d),and lowest feed coefficient(6.42-9.17).Pepsin and lipase activities in P.fulvidraco increased,indicating improved the digestive performance.While the activities of superoxide dismutase(SOD),catalase(CAT),glutathione peroxidase(GSH-Px),alkaline phosphatase(AKP)and acid phosphatase(ACP)decreased,showing that antioxidation and immune performance were inhibited.Affected by fish metabol-ism,there were differences in water quality factors such as ammonia nitrogen and dissolved oxygen in aquaculture water under different light intensities.This study showed that light intensity within 3-6 W/m^(2) could promote the growth and digestive performance of P.fulvidraco,and provides a theoretical basis for efficient culture of P.fulvidraco.