细指长臂虾的幼体发育

1991年4月，从长江口采回细指长臂虾抱卵亲虾，至实验室进行幼体培育。孵化后的幼体，在水温22℃．盐度12、饵料充足的条件下，有规律的每2d蜕皮1次，经10个状幼体期，变态为仔虾。如在发育后期遇饵料不足等不良环境条件的影响，则幼体须经11次蜕皮后，始能发育为仔虾。

THE LARVAL DEVELOPMENT OF PALAEMON TENUIDACTYLUS

Palaemon tenuidactylus Liu et al. is an important commerial shrimp, which lives in brackish estuaries of China. It shows small egg type of developmental pattern. The buds of the first and second pereiopods appear at the first zoeal stage, but the third and fifth at the second zoeal stage, and finally,the fourth at the third zoeal stage. Segmented pereiopods were completed in the fifth zoeal stage. Department of the pleopods in small egg type is delayed too. The buds of the pleopods appear in the sixth zoeal stage. The appendix interna appears at the ninth zoeal stage. Palaemon tenuidactylus and Palaemon gravieri live in the brackish estuaries. The larvae of these are also alike. For the sake of convenience, major different characteristics of the two species are fully given in the present paper.