刻裂丽蚌的繁殖生物学

ON REPRODUCTIVE BIOLOGY OF LAMPROTULA SCRIPTA HEUDE

从１９９１年８月至１９９２年９月研究了刻裂丽蚌的繁殖生物学。该蚌为夏季繁殖类型，其配子发生可分三个阶段：１２月底至次年４月为配子形成和生长阶段；５月至９月初为配子成熟和排放时期；９月中旬至１２月中旬为休止期。母蚌妊娠和产幼期在５月中下旬至９月初，其全部四片鳃都可作为育儿囊，属外鳃类（Ｅｘｂｒａｎｃｈｉａ）中的四生型（Ｔｅｔｒａｇｅｎａｅ）。幼虫半圆形无钩，在扫描电镜下，见其双壳腹缘中部各有一小的棘突。在３２～３３℃的水温，幼虫在寄主鱼的鳃上寄上５天左右即可变态为幼蚌。

The reproductive biology of Lammrotula scripta(Hedue) was studied during 1991 and 1992. Gametogenesis in this summer breeder was charactrized by three stages: gameteformation and growth in spring, gamete maturation and release(spawning) from May to the beginning of September, and resting period in winter. Females had glochidia in all four gills. The glochidia are hookless. By scan electronicmicroscope,two little spines can be discovered at the apex of the glochidial shell opposite the hinge line.Juveniles were dropped from their host fishes about 5 days later at mean water temperatures between 32 and 33℃.