酸化剂对奥尼罗非鱼生长性能和饲料利用的影响

Effects of acidifier on growth performance and feed utilization in hybrid tilapia (Oreochromis aureus ♂×O.niloticus ♀)

选用体重为5.35±0.02g的奥尼罗非鱼(Oreochromis aureus♂×O.niloticus♀)幼鱼480尾,随机分配在16个水族箱中,设计4个处理组,分别添加不同梯度水平的酸化剂(0%、0.1%、0.2%和0.3%),每组4个重复,每重复30尾鱼。通过8周的生长试验,来评价酸化剂对罗非鱼生长性能和饲料利用的影响。结果表明,饲料中添加0.3%的酸化剂显著促进了罗非鱼的生长(P<0.05),饲料系数及蛋白质效率也有一定的改善;不同水平的酸化剂不影响鱼体的水分、粗蛋白质、粗脂肪和粗灰分等营养指标;除0.3%组脏体比显著高于对照组外,各试验组鱼体的肝体比、脂体比和血液指标与对照组相比也无显著差异(P>0.05)。结果说明,饲料中添加0.3%的酸化剂可显著促进罗非鱼的生长和提高饲料的利用。

An 8-week feeding trial was conducted to study the effects of acidifier on growth performance and feed utilization of tilapia. Four hundred and eighty tilapia juveniles with an average body weight of 5.35 ±0. 02 g were randomly allocated into 16 tanks with 30 fish in each tank and fed with four experimental diets. The control group was fed with the basal diet, while the other groups were fed with diets supplemented with 0. 1% , 0. 2% and 0.3%, acidifier, respectively. The results showed that the growth performance of 0. 3% group was significantly improved （ P 〈 0. 05） compared with the control group. In addition, the feed coefficient and protein effieiency ratio improved accordingly. Supplementation of aeidifier with different concentration in tilapia diets did not significantly affect the moisture, protein, lipid and ash contents of fish body. Hepatosomatic index, intraperitoneal fat ratio, blood concentration of cholesterol, triglyceride, high-density or low-density lipoprotein were not affected, neither. However, the viscerosomatic index of 0. 3% group increased significantly compared with the control group （ P 〈 0. 05 ）. The results suggested that supplementation of 0. 3% acidifier in diets could significantly improve the growth performance and feed utilization of tilapia, but the fish meat quality was not affected.