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《Journal of Agricultural Sciences》 2010-04
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Effects of starvation on feeding and growth of Silurus lanzhou larvae

Zhao Hongxue1,2,Wu Xudong2,3,Li Li2,3,Wang Yuanji2,3,Lian Zongqiang2,3(1.School of Life Science,Ningxia University,Yinchuan 750021,China;2.Ningxia Fishery Engineering Technology Research Center,Yinchuan 750001,China;3.Ningxia Fisheries Institute,Yinchuan 750001,China)  
In laboratory conditions larvae of Silurus lanzhou were reared in water at about(22.5±1.2) to exam the starvation tolerance and the changes in feeding ability,growth and survive under starvation condition during early development stage.The results showed that the larvae of Silurus lanzhou of 3 days old began to feed,and initial feeding rate was 23.33%.The highest initial feeding rates reached 100% on the 6 days old.During ontogenesis process of Silurus lanzhou larvae,the mix feeding stage lasted about 2 days and yolk exhausted 4 days after hatching;while unfed larvae had the strongest feeding intensity.Unfed larvae reached the Point of no return(PNR) at 9 days after hatching,and the sum of effective temperature of PNR was 202.5d·℃.Death rate of unfed larvae beyond 50% at 7 days after hatching,and 10 days later the died totally.The starvation can delay the larvae's growth and development.The level of the growth and development in unfed larvae will be lower than feeding larvae if there have no food in mixed feeding stage.At the 11 days after hatching,the feeding larvae developed and different part of the body had different growth rate.The body weight and total length of unfed larvae performed remarkable negative rate.
【Fund】: 国家自然科学基金项目(30760191)
【CateGory Index】: S917.4
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