真鲷的生长和生态转换效率及主要影响因素

Growth and ecological conversion efficiency of red sea bream (Pagrosomus major) and mainly affecting factors

采用室内流水模拟实验法测定了真鲷的生长和生态转换效率 ,及其温度、摄食水平、饵料生物种类和群居行为因素的影响。真鲷的特定生长率随温度或摄食水平升高而减速增长 ,其关系分别可用公式SGR =2 .0 1LnT - 4.69(R2 =0 .9881)或SGR =0 .97Ln(FL) - 0 .2 5 (R2 =0 .9984)定量描述 ;而生态转换效率则随温度或摄食水平增大而增至一峰值 ,然后随其进一步增加而降低 ,其关系分别可用二次曲线Eg =- 0 .17T2 + 7.19T - 5 4.0 6 (R2 =0 .9945 )或Eg =- 1.10FL2 + 10 .16FL + 5 .5 4(R2 =0 .9995 )定量描述 ,且依据上述公式可分别求得实验条件下的最佳生长温度为 2 0 .8℃ ,维持摄食量和最佳摄食量分别为真鲷体重的 1.2 9%和 4.60 %。真鲷的群居性和摄食小型鱼类饵料 ,有利于加速其生长速度 ,却对生态转换效率无显著影响。

It was determined by running water simulating experiment in laboratory about special growth rate(SGR) and ecological conversion efficiency(Eg) of red sea bream (Pagrosomus major) and effect of some factors on them , such as temperature, ration, food species and social behavior. SGR of the fish increased with rise of temperature or ration. Their quantity relation could be described as SGR=2.01LnT-4.69 (R 2=0.9881) or SGR=0.97Ln(FL)-0.25 (R 2=0.9984). Ecological conversion efficiency gradually decreased after increasing to a peak value with their rise. Their quantity relation could be described as Eg=-0.17T 2+7.19T-54.06 (R 2=0.9945) or Eg=-1.10FL 2+10.16FL+5.54 (R 2=0.9995). According to the above formula, they could be calculated that optimum growth temperature was 20.8℃, and maintenance ration and optimum ration were respectively 1.29% and 4.60% of the body weight. The growth could be quickened by its social behavior and taking in small sized fish, but ecological conversion efficiency did not.