|
|
|
| Effects of Different Size and Density on Intermediate Seedling Culture of Sea Cucumber,Apostichopus j aponicus in Net Cages Disposed in Earthen Ponds |
| WU Yanqing,ZHANG Yuxiang,DU Rongbin,WANG Zhibao,WANG Renlong,LIU Liming,LI Xiaojie |
|
|
|
|
Abstract Seedling culture of sea cucumber (A postichopus j aponicus) ,using net cages in earthen ponds , is a semi‐ecological seedling protection pattern arising in recent years .Field experiment was conducted in net cages set in earthen pond to investigate the effects of size [large size (0 .093 ± 0 .004) g/ind and small size (0 .024 ± 0 .001) g/ind] and density (low density 125 g/m3 ,middle density 250 g/m3 and high density 375 g/m3 ) on grow th ,yield and survival rate of sea cucumber during intermediate seedling culture period from July to October in 2014 .The results showed that the body weight and the specific growth rate of seedling were in low density higher than that in middle density and high density in the same size ,that the large size had significantly higher survival rate than the small size in the same density groups (P<0 .05) , that the survival rate of small size in low density was significantly higher than that in high density (P<0 .05) ,and that the survival rate of large size was significantly higher in low density than that in middle density and high density (P<0 .05) .There was no significant difference in total yield of seedling in differ‐ent density cages (P>0 .05) ,higher net production of seedling in low density than that in middle density and high density .The two‐way ANOVA revealed that the main effect of size and the interaction of two factors had significant influence on the survival rate (P<0 .05) ,the main effect of density had a highly sig‐nificant influence on the survival rate (P<0 .001) .The main effects as well as the interaction of the two factors were not found to be significant influence on the total yield (P>0 .05) .The main effect of size and the interaction of the two factors did not show significant influence on net production (P>0 .05) ,while main effect of density had a significant influence on net production (P<0 .05) .Therefore ,releasing of large size seedling with low density could not only ensure high survival rate and net production ,but also save seedling resources and feed quantity ,reduce the production and management cost per unit area ,eleva‐ting input‐output ratio and economic benefit during intermediate seedling culture period of sea cucumber .
|
|
Received: 25 June 2016
|
|
|
|
|
|
|
