真鲷幼鱼的摄食与生态转换效率──一种现场研究方法在室内的应用

THE CONSUMPTION AND ECOLOGICAL CONVERSION EFFICIENCY OF AGE-0 RED SEA BREAM(PAGROSOMUS MAJOR), THE LAB APPLICATION OF AN IN SITU APPROACH

1997年10月在黄海水产研究所小麦岛实验基地，采用Eggers模型现场研究方法在室内对人工培育的真鲷幼鱼(26.33±5.79g)进行了摄食和生态转换效率的研究。真鲷幼鱼的日摄食量12.97gw.w./100gw.w.·d,摄食率3 119.00cal/ind·d,生态转换效率19.40%。真鲷幼鱼的摄食与温度变化显著相关，消化道内含物量与水温的相关关系符合方程DCW=0.023 4·e0.256 3Temp.(P<0.001)。从每日的03∶00始，真鲷幼鱼消化道内含物的量随时间逐渐增加，至17∶30达到最高值,表现出单一摄食高峰，显示出其代表的真鲷黄、渤海种群与东海种群之间存在摄食节律方面的显著差异。研究结果表明，Eggers模型这一现场研究方法也适于室内研究鱼类摄食,特别对于那些现场不易获得的鱼种，是研究其摄食的一种既简便又准确的方法。

The consumption and ecological conversion efficiency of age0 red sea bream（Pagrosomus major）were investigated using Eggers model,an in situ approach,in lab in the Maidao experimental base of the Yellow Sea Fisheries Research Institute,Qingdao, where the fish was artificially hatched and reared on mass.The daily food consumption of age0 red sea bream (26.33±5.79g) was 12.97gw.w./100gw.w.·d.Its consumption rate was 3 119.00cal/ind·d,evacuation rate was 0.164 7gw.w./100gw.w.·h.Its food and energy conversion efficiency was 9.22% and 19.40% respectively.Consumption of the fish correlated with the ambient water temperature significantly(P<0.001).The relationship between its complete digestive tract content weight as a percent of body weight(DCW)and ambient water temperature(Temp.)was DCW=0.023 4·e0.256 3Temp.. The DCW increased gradually from 03∶00 to 17∶00; the unique feeding peak highlights the difference between the bream feeding rhythm of the population in the YellowBohai Sea and that of the population in the East China Sea. The results imply that the Eggers model is suitable for lab experiment to get results close to that from the field. It offers a simple and offective lab research method for determining fish consumption, growth and ecological conversion efficiency, especially for some fish their consecutive samples in situ can not be collected easily.