盐度对条石鲷摄食、生长和肌肉生化组成的影响

在水温为27～29℃下,进行了盐度(10、15、20、25、30、35)对条石鲷幼鱼Oplegnathus fasciatus (体质量为8.1～9.0 g)的摄食、生长和肌肉生化组成的影响试验.试验在18个体积为400L的黑色塑料圆桶中进行,共饲养28 d.结果表明:盐度对条石鲷幼鱼的生长有显著影响(P＜0.05),试验结束时,条石鲷的体质量、全长、体长在盐度为25、30时增加较多,与其他各组差异显著(P＜0.05)；体质量特定生长率、体长特定生长率和食物转化率在盐度为30时最高,分别为2.90％/d、1.83％/d和97.50％,在盐度为10时最低,分别为2.15％/d、1.20％/d和78.85％,均与其他各组差异显著(P＜0.05)；摄食率在盐度为25时最高,为3.00％,在盐度为35时最低,为2.59％,均与其他各组差异显著(P＜0.05)；盐度对条石鲷肌肉中的水分、粗蛋白和粗脂肪含量影响不显著(P＞0.05).研究表明,条石鲷的适宜生长盐度为25～30.

Effects of salinity on feeding,growth and muscular biochemical composition in striped knifejaw Oplegnathus fasciatus

Juvenile striped knifejaw Oplegnathus fasciatus with body weight of 8.1-9.0 g was reared in a black plastic 400 L tank at a salinity of 10,15,20,25,30,and 35 at water temperature of 27-29 ℃ for 28 days to study the effects of salinity on feeding,growth and biochemical composition in the fish.The results showed that there were significant higher body weight,total length and body length in the juveniles at a salinity of 25,and 30（P0.05）.The maximal weight specific growth rate（2.90%/d）,body length specific growth rate（1.83%/d） and food conversion rates（97.50%） were observed at a salinity of 30,and with maximal feeding rates of up to 3.00% at a salinity of 25,significant differences with other groups（P0.05）.However,the minimal weight specific growth rate（2.15%/d）,body length specific growth rate（1.20%/d） and food conversion rates（76.85%） were found at a salinity of 10,and with minimal food intake rates of 2.59% at a salinity of 35,and the maximal food intake of 3.00% at a salinity of 30,significant differences with other groups（P0.05）.There were no significant differences in moisture,protein and fat contents in the muscles of the juveniles（P0.05）.In conclusion,it is suggested that the salinity of 25-30 be of optimum for growth in Oplegnathus fasciatus.