投喂频率对2龄似鲇高原鳅生长的影响

Effects of feeding frequency on growth performance of two-year-old Triplophysa siluroides

摘要:

为探究不同投喂频率对似鲇高原鳅(Triplophysa siluroides)生长的影响,在循环水养殖条件下,采用人工配合饲料,分别以0.5次/d、1次/d(早上8:00)、1次/d(晚上20:00)、2次/d、3次/d、4次/d等6种投喂频率,对平均体质量为(88.26±5.38)g的2龄似鲇高原鳅进行了饲养试验,试验时长为61 d。结果显示,试验结束时,各试验组鱼的成活率无显著差异；在投饲量相同的情况下,随着投喂频率的增加,0.5次/d、2次/d、3次/d、4次/d组的体质量增长率显著高于1次/d组(P＜0.05)；2次/d组的特定生长率显著高于其他组(P＜0.05),而饲料系数显著低于0.5次/d、1次/d、4次/d组(P＜0.05)；在形态指标方面,2次/d组鱼的脏体比显著高于0.5次/d组(P＜0.05)。试验结果表明,循环水养殖条件下似鲇高原鳅的最佳投喂频率为2次/d。

Abstract:

To investigate the effect of feeding frequency on the growth performance of Triplophysa siluroides cultured in recirculating aquaculture system,two-year-old T. siluroides with average body weights of (88.26±5.38)g were randomly allocated into six groups.The fish were cultured for 61 days and fed once every two days,once(8:00 am or 8:00 pm),twice,three times,four times per day.The results showed that there was no significant difference in survival rate among experiment groups.With the increase of feeding frequency,the weight gain rate(WGR) of T. siluroides in 0.5 meals/d,two meals/d,three meals/d and four meals/d groups were significantly higher than that of one meal/d group(P＜0.05), and the specific growth rate(SGR) of two meals/d group was significantly higher than that of others(P＜0.05),while the feed coefficient ratio(FCR) was significantly lower than that of 0.5 meals/d,one meal/d,four meals/d groups(P＜0.05).As for morphological indexes,the visceral body ratio in the two meals/d group was significantly higher than that in the 0.5 meals/d group(P＜0.05).The results showed that the optimal feeding frequency of T. siluroides was recommended to be two meals per day in recirculating aquaculture.