投喂频率对瓦氏黄颡鱼幼鱼生长及蛋白酶活力的影响

Effect of feeding frequency on the growth and protease activities of Pelteobagrus vachelli

研究了不同投喂频率对瓦氏黄颡鱼幼鱼的摄食率、特定生长率、饲料转化率及蛋白酶活力的影响。实验共设5组不同投喂频率:0.5、1、2、3和4次/d,每组3个重复,每次饱食投喂。隔20d取样检验一次,试验周期60d。研究发现:21-60 d瓦氏黄颡鱼幼鱼的摄食率和特定生长率随投喂频率的增加而显著升高(P<0.05);3次/d组饲料转化率显著高于0.5次/d组(P<0.05),而其他各组间无显著差异(P>0.05);胃和肠蛋白酶活力随投喂频率增加而显著降低(P<0.05)。根据实验结果,建议瓦氏黄颡鱼幼鱼在集约化饲养条件下的最适投喂频率为3次/d。

Experiments were conducted to investigate the influence of feeding frequency on feeding rate, specific growth rate, food efficiency and protease activities in a native fish, Pelteobagrus vachelli. Five groups of the juveniles were fed to satiation including： one meal in two days, one meal per day, tow meals per day, three meals per day or four meals per day for 60 days, and the fish were sampled every 20 days. The results showed that from the 21st to 60th day, as feeding frequency increasing, the feeding rate and special growth rate increased significantly （ P 〈 0.05 ） ; and the fish fed with three meals per day showed higher food efficiency than the fish fed with one meal in two days （ P 〈 0.05 ） ; but the rests were not significantly different with each other （P 〉 0.05 ）. On the other hand, as feeding frequency decreased, stomach and gut protease activities increased significantly （P 〈 0.05）. The present study suggested that the feeding rate of three meals per day is profitable for intensive culture of Pelteobagrus vachelli.