Effects of Delayed Feeding on Ingestion,Growth and Survival of Misgurnus anguillicaudatus Larvae
延迟投饵对泥鳅仔鱼摄食、生长和存活的影响

Effects of delayed initial feeding on ingestion,growth and survival of oriental weatherfish(Misgurnus anguillicaudatus) larvae were investigated under the condition of water temperature of(27±1)℃,different initial feeding time being 0,1,2,3,4,5,6,7 days delayed,and M.anguillicaudatus being starved.The results showed that the larvae of oriental weatherfish opened mouth 3 days of age,mix of nutrition period was 2 days,and complete yolk sac absorption was 4 days of age.The initial feeding rate was 36%;the highest initial feeding rates reached 98%,oriental weatherfish 5 days of age.The point of no return(PNR) of starvation was in 8th-9th day after hatching.The body length of oriental weatherfish larvae of 0 day and 1 day groups of delayed feeding indicated constant growth,with no significant difference(P>0.05)between two groups till 11 days.With the days of delayed feeding increasing,the growth rate of M.anguillicaudatus larvae obviously decreased.The M.anguillicaudatus larvae under the absolutely starved condition indicated positive growth between 3days old and 5 days old,but subsequently appeared negative growth.At the age of 11 days,the survival rates of the larvae of delayed feeding of 0 day and 1 day were separately 82.67% and 89.33%,and there were no significant difference(P>0.05).With feeding days of delayed feeding rising,on the 11th day,the survival rates of the larvae obviously reduced,while all the larvae died in the starvation group.