暂养底质对小刀蛏亲贝生长和存活的影响

本研究比较了混合泥、池塘泥和海沙三种底质对小刀蛏亲贝生长和存活的影响。利用粒度仪测定三种底质粒度,混合泥和池塘泥粒径分别为49. 01pm和52. 18μm,海沙粒径为285. 84μm。在三种底质中暂养30d后,混合泥和池塘泥组小刀蛏的存活率均为60%,显著高于海沙组的6. 67%;混合泥和池塘泥组小刀蛏的干重特定生长率分别为4. 87%/d和4. 37%/d,均显著高于海沙组;混合泥和池塘泥组小刀蛏的体长特定生长率分别为2.34%/d和2.03%/d,同样均显著高于海沙组的1. 1%/d;三个实验组的小刀蛏肥满度都有所增长,混合泥和池塘泥中小刀蛏的肥满度分别为35. 74%和35. 79%,较初始时增长显著,海沙中小刀蛏肥满度为32. 98%,增长不显著。综上所述,混合泥和池塘泥更适于小刀蛏亲贝的暂养。本研究优化了小刀蛏亲贝的暂养条件,为小刀蛏人工育苗技术提供理论支持。

Effects of Different Sediments on the Growth and Survival of Cultellus Attenuates

The effects of temporary rearing in three kinds of sediments including mixed mud, pond mud and sea sand on the growth and survival of Cultellus attenuatus were analyzed in this study. The size of the three sediments was 49. 01μm, 52. 18pm and 285. 84μm, respectively, as was measured by particle size analyzer. After 30d temporary rearing in these sediments, the survival rate of C. attenuatus in mixed and pond muds was 60%, significantly higher than that in sea sand. The specific growth rate of weight and body was the highest in mixed mud, which was 4. 87% and 2. 34%, respectively, followed by 4. 37% and 2. 03% in pond mud and the lowest in sea sand. Relative fatness of mixed and pond muds and sea sand was improved to 35. 74%, 35. 79% and 32. 98%, respectively. The relative fatness of C. attenuatus in mixed and pond muds was significantly increased from that at the beginning, but not in sea sand. The mixed and pond muds were more suitable than sea sand for temporary rearing of C. attenuatus .In this study, we optimized the temporary rearing condition for C. attenuatus, which should be helpful to the development of artificial rearing techniques.