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Influences of stocking density of domestication on growth of juvenile Brachymastax lenok

ZHANG Yu-yong1,XU Ge-feng1,JIN Shu-bo2,MU Zhen-bo1 (1.Heilongjiang Fishery Research Institute,Chinese Academy of Fishery Science, Harbin 150070,China;2.Biotechnology Department,Chengdong College of Northeast Agriculture University,Harbin 150030,China)  
In this paper the effects of stocking density on the growth and survival of juvenile Brachymastax lenok were studied.Experimental fish were reared in four different stocking density(1 000,5 000,10 000,15 000 ind/m2) for 40 days.During experiment period,using the domestication method of gradually transition(Limnodrilus sp →Limnodrilus sp,soft granular food →soft granular food,hard granular food→hard granular food),the fish fry can be weaned to artificial dry foods by gradually reducing the animal feed.Result showed that the survival rate was significantly affected by stocking density,but not for condition factor(CF),special growth rate(SGR) and coefficients of variation(CV).In this experiment,the death rates were 32.8%,28.7%,16.0% and 19.3% for the stocking densities of 1 000,5 000,10 000,15 000 ind/m2,respectively.CF ranged from 0.85 to 0.97,SGR ranged from 0.37% to 7.73%,the body weight CV ranged from 11.59 to 16.89%,and the body length CV ranged from 37.05 to 48.48%.The results demonstrated that lenok juvenile(2.80±0.01 cm) can be reared in high stocking density during the domestication period.
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