延迟投饵对鲇仔鱼摄食、存活和生长的影响  

Effect of delayed feeding on feeding ability,survival and growth of Silurus asotus larvae

作　　者：乔志刚[1] 常国亮[1] 张建平[1] 牛景彦[1] 王武[2] 

机构地区：[1]河南师范大学生命科学学院,河南新乡453002 [2]上海水产大学生命科学学院,上海200090

出　　处：《上海水产大学学报》2007年第2期130-134,共5页Journal of Shanghai Fisheries University

基　　金：河南省自然科学基金资助(0324030026)

摘　　要：水温22-24℃时,鲇仔鱼3日龄开口摄食,初次摄食率为18%,最高初次摄食率出现在5日龄,达100%;鲇仔鱼个体发育过程中存在混合营养期,正常摄食时,混合营养期为2 d,完全饥饿状态下,仔鱼的卵黄囊至4日龄即完全消失;7-8日龄,鲇仔鱼如不能建立外源性营养,将很快进入饥饿不可逆(PNR)点;随延迟投饵天数的增加,仔鱼成活率明显降低,延迟6 d投饵,11日龄仔鱼全部死亡;完全饥饿组仔鱼,至10日龄全部死亡;仔鱼全长和湿重的增长率随延迟投饵天数的增加而下降,完全饥饿条件下,1日龄至6日龄仔鱼全长呈正增长,随后转为负增长;1日龄至4日龄仔鱼湿重呈正增长,随后转为负增长。When the water temperature was 22 - 24℃, the larvae of Silurus asotus of 3 days old began to feed, and initial rate was 18.00%. The highest initial feeding rates reached 100% , and appeared on the 5 days old. During ontogenesis process of Silurus asotus larvae, there was a mix vegetative period. Delayed 0 d to feed, the mix vegetative period was 2 d. Under the absolutely hungry condition, the mix vegetative period only lasted 1 d. 7 - 8 days old, if the larvae of Silurus asotus couldn＇ t get the extraneous source nutrition, the larvae quickly entered point of no return （PNR）. It was 6 -7 d for larvae to have the ability to initially feed. With the feeding time delayed, the survival rates obviously reduced. If delayed 6 d started to feed, all of larvae died 11 days old. The absolutely hungry group died 10 days old. With the feeding time delayed, the increment rates of the total length and wet weight reduced. Under the absolutely hungry condition, the larval total length of Silurus asotus presented the positive growth between 1 day old and 6 days old, subsequently appeared the negative growth. The larval wet weight of Silurus asotus presented the positive growth between 1 day old and 4 days old, subsequently appeared the negative growth.

关 键 词：鲇 仔鱼 延迟投饵 摄食 存活 生长 

分 类 号：S917[农业科学—水产科学]