影响刺参幼参成活和生长的几个因素的研究

在刺参人工育苗过程中，从稚参到幼参阶段极易受外界综合因子影响，成活率很低。本文采用数理统计的方法，选择四种因子对此阶段死亡率进行试验。从方差和直观分析看到稚参的附着密度和饵料品种对其成活率和生长的影响大于水温和换水方式。稚参附着密度以0．2头／cm^2为最佳，0．5头／cm^2次之；饵料以鼠尾藻磨碎液为最佳，其次是鼠尾藻液和叉鞭金藻的混合液．

THE EFFECT OF SOME EXTERNAL FACTORS ON SURVIVAL AND GROWTH OF JUVENILE SEA CUCUMBER

In the course of studying the artificial hatchely rearing of seacucumber Apostichopus japonicus, it was found that the survival rate of juveniles seacucumber was low. The period of development from seedling to juvenile was anothercritical phase in its life cycle. During this phase, the juvenile were mostr susceptible tothe adverse influence of their environment. The method of mathmatical statistics was applied to test the effect of severalfactors influencing the survival rate during the juvenile stage. Four factors wereselected, viz., settling density of seedling, types of feeds, temperature of the culturemedium, and the mode of water exchange. The results from the variance analysis anddirect observation indicated that settling density and types of feeds were more impor-tant than other two factors in fluencing the survival and growth rates of juvenilesea cucumber. A settling density of about 0.2 individuals/cm~2 was optimal, of 0.5individuals/cm~2 less favorable. A filtrate of ground Sargassum proved to be the bestfood for juvenile, and the next best was a mixture of ground Sargassum and Dicra-tina.