不同饵料对奥尼罗非鱼仔稚鱼生长发育及消化酶活力的影响

将初始体质量为(0.006±0.0005)g的仔鱼,随机分为4组,每组3个平行,分别投喂4种饵料:人工配合饵料、轮虫、蛋黄和轮虫+人工配合饵料.试验周期为28 d.结果表明,(1)轮虫+人工配合饵料和人工配合饵料组生长较快,特定生长率分别为0.014 %/d和0.013 %/d, 绝对生长率达到0.150、0.142 g/d,二组差异不显著(P>0.05);蛋黄组生长最慢,与其他各组差异显著(P<0.05).(2)轮虫+人工配合饵料与轮虫组仔稚鱼的成活率达到90.3%和 89.7%,大部分个体发育进入幼鱼阶段,二组差异不显著(P>0.05);蛋黄组存活率较低,只有40.7%,与其他各组差异显著(P<0.05).(3)投喂不同饵料对奥尼罗非鱼仔稚鱼的消化酶具有显著影响,蛋黄组的淀粉酶和脂肪酶活力显著高于其他各组(P<0.05);轮虫+人工配合饵料组的胃蛋白酶活力较高,天然饵料(轮虫)组较低.

Effects of Different Diets on Growth,Development and Digestive Enzymes Activity in Tilapia Hybrid Larvae

The larval hybrid tilapia (Oreochromis niloticus×O. aureus)with initial body weight of (0.006±0.0005) g was fed either artificial diet, rotifers, eggs or rotifers and artificial diet for 28 days with triplication to elucidate the effects of food items on growth, development and activities of the digestive enzymes. The larval tilapia had the best growth (absolute growth rate of 0.150/d and 0.142 g/d and specific growth rate of 0.014%/d and 0.013%/d (P<0.05) when fed rotifers and artificial and artificial diet while the larvae fed the eggs had the worst growth (P<0.05). There were survival of 90.3% and 89.7% in the developed well larvae fed rotifers and artificial or rotifers. The slow developmental larval tilapia fed the eggs had the lowest survival (40.7%). On the activity of the digestive enzymes, different diets had significant effect on activity of the digestive enzymes in the hybrid tilapia larvae (P<0.05). There were the maximal activities of amylase and lipase in the larvae fed the eggs and the maximal activity of pepsin was observed in the larvae fed the rotifers and artificial diets. The minimal activity of pepsin, however, occurred in the larvae fed the eggs.