日本沼虾幼体摄食量及生长的研究

于1990年6月—7月,用南京丰年虫无节幼体作饵料,在培养皿中对日本沼虾溞状幼体作单只培养,测定了各期溞状幼体(Z_1—Z_9)的日摄食量及总摄食量,并观察了饥饿条件下溞状幼体的生长与成活情况。实验表明,Z_1,Z_2阶段,不投饵并不影响其变态和成活率;但自Z_1孵出连续饥饿5d后,即使投饵,溞状幼体也不能正常蜕壳和成活;Z_3阶段是摄食量增加的突变期。南京丰年虫无节幼体是日本沼虾幼体的适口饵料,P_1育成率可达70％。

FOOD UPTAKE AND GROWTH OF MACROBRACHIUM NIPPONENSIS LARVAE FED WITH CHIROCEPHALUS NANKINENSIS

During June-July, 1990 study using nauplii of the fairy shrimp Chirocephalus naukinensis (Shen) as feed, the daily and total food uptake of the freshwater shrimp Macrobrachium nip-ponensis (de Haan) zoeae in development stages (Z1-Z9), reared individually in culture dishes were measured, and their growth and survival of the zoeae under the condition of starvation were also observed. The experiment indicated that deprivation of food had no effect on the metamor phosis and survival rate of Z1 and Z2, but if they were deprived of food for 5 days after hatching they could not molt and survive normally even though food was given to them then. Z3 was a stage of rapid increase in food uptake. The nauplii of Chirocephalus nankinensis are considered to be suitable food for Macrobrachium nipponensis larvae. In the experiment, 70% survival through metamorphosis from Z1 to P1 was obtained among the larvae fed with the nauplii.