单 位：
上海水产大学农业部水产动物种质资源与养殖生态生理重点开放实验室
摘 要：
将 72尾杂交罗非鱼分别养在 12个水槽内 ,每个水槽内养 6尾大小不同的鱼 (A、B、C、D、E、F) ,其中鱼A的初始体重为 62 .69± 1.46g ,B为 5 6.48± 1.3 0g ,C为 5 0 .75± 1.19g ,D为 3 5 .5 6± 1.18g ,E为3 1.0 5± 0 .88g ,F为 2 7.3 5± 0 .95 g(平均值±标准误 ) .在 4周实验中 ,实验鱼分别被停食或每天按体重1.5 %、3 .0 %和饱食水平投喂 .鱼的特定生长率 (SGR)和食物效率 (FE)先随食物水平增加而增加 ,当食物水平超过鱼体重的 3 .0 %后 ,继续增加投喂量 ,SGR不再升高而FE明显下降 .按体重 1.5 %投喂的鱼SGR和终体重个体间变异较大 .对鱼A而言 ,食物水平超过体重 1.5 %后对其SGR无显著影响 ,但对鱼F而言 ,食物水平对SGR影响较大 .结果表明 ,杂交罗非鱼的生长和个体生长分化与食物条件和初始体重有关 ,当食物水平超过体重的 3 .0 %后 ,鱼的SGR较高 ,个体生长分化相对较轻
译 名：
Influences of ration level and initial body weight on growth and size hierarchy of hybrid tilapia,Oreochromis mossambicus×O.niloticus.
作 者：
WANG Yan( Key Laboratory of Aquatic Animal Genetic Resources and Ecology in Aquaculture ,Ministry of Agriculture of China,Shanghai Fisheries University, Shanghai 200090,China).
关键词：
Hybrid tilapia, Growth, Ration level, Body weight
摘 要：
hybrid tilapia were distributed into twelve tanks, each stocked in six fish(A,B,C,D,E,F) with different body size. The initial body weight was 62.69±1.46 g for fish A, 56.48±1.30 g for B, 50.75±1.19 g for C, 35.56±1.18 g for D, 31.05±0.88 g for E, and 27.35±0.95 g for F (mean±SE). The fish were reared under four ration levels (deprived of feed, fed at 1.5% body weight per day (BW·d -1 ), fed at 3.0% BW·d -1 , or fed excess) throughout four weeks, respectively.The specific growth rate (SGR) and feed efficiency (FE) of the fish increased with increasing ration level up to 3.0%BW·d -1 , and then, SGR maintained at a constant level while FE dropped with continuing increase of ration.The variance coefficient of SGR and final body weight was relatively high in the fish that fed at 1.5 % BW·d -1 .For fish A, SGR was not significantly different, between 1.5 %BW·d -1 ,3.0%BW·d -1 and fed excess, while in fish F,relatively high variations were found among different ration treatments. This experiment revealed that the growth and size hierarchy of hybrid tilapia were related to their ration level and initial body size. Under ration levels more than 3.0%BW·d -1 , SGR was usually high, and size hierarchy was relatively weak.
