【摘要】 研究了5种投喂频率及投喂时间对长薄鳅仔稚鱼生长性能的影响。结果表明:投喂频率及投喂时间对长薄鳅仔稚鱼的生长具有显著影响。对于4～14日龄的长薄鳅仔鱼,随着投喂频率的增加,其增重率及特定生长率呈先升高后下降的趋势,当投喂频率为4次/d时,增重率及特定生长率达最大值;存活率以6次/d组最高;随着投喂频率的增加,体重的变异系数呈先下降再升高的趋势,在4次/d组出现最低值。因此在投饵量相同的条件下,4～14日龄的长薄鳅仔鱼的最适投喂频率为4次/d。在15日龄以后,随着日投喂时间的推移,长薄鳅仔稚鱼的摄食率呈上升趋势,在20:00投喂组摄食率达到最大值;增重率、特定生长率、饵料效率呈先下降后升高的趋势,在14:00投喂组出现最低值,在20:00投喂组出现最大值,且显著高于其它各投喂时间组;存活率以20:00投喂组最高。更多还原

【Abstract】 The effects of five feeding frequency and time on growth of larvae and juvenile of Leptobotia elongata were studied. The results showed that feeding frequency and feeding time had significant effects on growth, survival rate and feed efficiency of larval and juvenile Leptobotia elongata. Within 4～14 d after hatching, the weight gain rate(WGR) and specific growth rate(SGR) increased first and then decreased. When the feeding frequency was 4 times/d, the WGR and SGR reached the maximum. The survival rate was the highest in the 6 times/d group. The extent of inter-individual size variation(change in CV)decreased first and then increased with the increase of feeding frequency. The lowest value was found in 4 times/d group. The optimal feeding frequency is 4 times/d under the same feeding amount for each feeding group. After 15 days of age, with the development of daily feeding time, the FR showed an upward trend, the feeding group at 20:00 was the maximum, while the WGR, SGR and feed conversion ratio were decreased first and then increased. The feeding group at 14:00 was the lowest and reached the maximum at 20:00, which was significantly higher than that of other feeding groups. The survival rate was also the highest at 20:00.更多还原