Effects of rearing temperature and density on growth,survival and development of sea cucumber larvae,Apostichopus japonicus(Selenka)  

作　　者：刘广斌 杨红生 刘石林 

机构地区：[1]Institute of Oceanology,Chinese Academy of Sciences [2]Graduate University of Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2010年第4期842-848,共7页中国海洋湖沼学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China(863 Program)(No.2006AA10A411);Shandong Agriculture Seed Stock Projects

摘　　要：In laboratory conditions,effects of rearing temperature and stocking density were examined on hatching of fertilized egg and growth of auricularia larvae of Apostichopus japonicus respectively.Data series like larval length and density,metamorphic time,and survival rate of the larvae were recorded.Statistics showed that for A.japonicus,survival rate(from fertilized egg to late auricularia) decreased significantly with the increasing rearing temperature(P<0.05).At different temperatures SGR was statistically significant as well(P<0.05) from day 1,and maximal SGR was found on day 9 at 24℃(159.26±3.28).This study clearly indicated that at low temperature(<24℃),metamorphic rate was remarkably higher than at higher temperature(>26℃).Hatching rate was significantly different between 0.2-5 ind./ml groups and 20-50 ind./ml groups.Rearing larvae at the higher density had the smaller maximal-length,whereas needed longer time to complete metamorphosis.This study suggested that 21℃ and 0.4 ind./ml can be used as the most suitable rearing temperature and stocking density for large-scale artificial breeding of A.japonicus's larvae.In laboratory conditions,effects of rearing temperature and stocking density were examined on hatching of fertilized egg and growth of auricularia larvae of Apostichopus japonicus respectively.Data series like larval length and density,metamorphic time,and survival rate of the larvae were recorded.Statistics showed that for A.japonicus,survival rate（from fertilized egg to late auricularia） decreased significantly with the increasing rearing temperature（P〈0.05）.At different temperatures SGR was statistically significant as well（P〈0.05） from day 1,and maximal SGR was found on day 9 at 24℃（159.26±3.28）.This study clearly indicated that at low temperature（〈24℃）,metamorphic rate was remarkably higher than at higher temperature（〉26℃）.Hatching rate was significantly different between 0.2-5 ind./ml groups and 20-50 ind./ml groups.Rearing larvae at the higher density had the smaller maximal-length,whereas needed longer time to complete metamorphosis.This study suggested that 21℃ and 0.4 ind./ml can be used as the most suitable rearing temperature and stocking density for large-scale artificial breeding of A.japonicus＇s larvae.

关 键 词：Apostichopus japonicus egg HATCH LARVAE GROWTH METAMORPHISM 

分 类 号：S917.4[农业科学—水产科学]