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本试验研究了给在海水中养殖的部分淡水罗非鱼投喂高盐饵料对其存活率的影响。实验进行了4周,每周将投喂高盐饵料(10%NaCl)的莫桑比克罗非鱼(O.mossambicus)、斯匹勒斯罗非鱼(O.spilurus)和奥丽亚/尼罗罗非鱼杂交种(O.aureus/O.niloticus hybrids)直接移养于不同盐度的水体中,估算其存活率。投喂含氯化钠的饵料可大幅度提高成活率:莫桑比克罗非鱼达84%,奥/尼罗非鱼杂种达62%,斯匹勒斯罗非鱼达50%。莫桑比克和奥/尼罗非鱼杂种在投喂含盐饵料2周后存活率最高,斯匹勒斯罗非鱼则在3周后存活率最高。据以往记录,直接移养60%海水中,鱼的血浆浓度会突然增大。然而,移养前投喂高盐饵料放入海水后,血浆浓度仅稍有增加。
The present study investigated the effects of high salt diet on the viability of some freshwater tilapia cultured in seawater. The experiments were carried out for 4 weeks. O.mossambicus, O.spilurus and Aoliya / Nilerox were fed weekly with high salt diet (10% NaCl) The non-fish hybrids (O.aureus / O.niloticus hybrids) were directly transferred to different salinities of water to estimate the survival rate. Survival rates were significantly improved by feeding sodium chloride-containing baits: 84% of tilapia in Mozambique, 62% of hybrids of Alaska / Nile tilapia and 50% of Spilus tilapia. Mozambique and Oreochromyon / Nile tilapia hybrids had the highest survival rates after 2 weeks of salt-fed diets, whereas Spirillum tilapia had the highest survival rates after 3 weeks. According to historical records, the direct transfer of 60% of seawater, the fish’s plasma concentration will suddenly increase. However, plasma concentrations increased only slightly after feeding high-salt bait to seawater prior to rearing.