摘要
刚孵化的锯缘青蟹第一期蚤状幼体 ,经不同时间饥饿后再予投饵 ,结果表明 ,饥饿可显著降低幼体的存活率和延长其发育期 ,饥饿时间 ( t)和发育期长 ( D)呈线性关系 ( D=4 .81+1.81t,r=0 .96,p<0 .0 0 1) ,对于青蟹蚤 I 幼体 ,起始饥饿时间超过 4 d,再予投饵 ,幼体均不能恢复到正常发育和蜕皮 ,即其“不可恢复点 ( point of no- return,PNR)”约为 4 d.若幼体孵化后马上投喂 ,但在投喂后不同时间间隔使幼体饥饿 ,50 %青蟹蚤 I 幼体达到“营养贮存饱和点 PRS50 ( Point- of- reservesaturation)”的投喂时间为 2 .3d,约为正常发育期长 4 .5d的一半 .对已通过 PRS点的幼体 ,饥饿一般不影响其蜕皮和发育 。
Effects of particular starvation on survival and development of newly hatched zoea 1 larvae of the mud crab, Scylla serrata , were investigated in the laboratory. The results showed that duration of larval development and mortality rates of the larvae of the crab increased with the prolongation of the initial feeding period and even a short period (8 or 12 hours) of starvation right after hatching, the survival and development of the larvae were affected. Starve of 4 days or more, no larvae retained the ability of molting when re fed. The results also indicated that PNR 50 (Point of no return) of the larvae is around 113 days. On the other hand, initial feeding for 1 day only, among 25 larvae tested, there was a larva molted to zoea 2 without further feeding. After 3.5 days initial feeding, starvation appears to have no significant affects on the survival of larvae to next stage. The experimental results also showed that PRS 50 (Point of reserve saturation) of the crab larvae was around 2.3 days, about half of the normal development duration (4.5 days) of the stage for feeding control. It was surprising to find that after initial feeding, starvation seems to enhance the development of zoea 1 larvae to zoea 2 slightly. The present results suggested that in the commercial rearing of larvae of the crab, efforts should be made to fed larvae as soon as possible after their hatching.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第3期782-788,共7页
Journal of Xiamen University：Natural Science
基金
福建省重中之重"福建省海洋生物优良种质和生物活性物质的应用基础研究"资助项目
关键词
锯缘菁蟹
幼体
饥饿
存活
发育
Scylla serrata
zoea 1 larvae
starvation
development
survival
