尖刀蛏的生殖周期

THE REPRODUCTIVE CYCLE OF Cultellum Scalprum (GOULD)

本文是尖刀蛏Ｃｕｌｔｅｌｌｕｍ ｓｃａｌｐｒｕｍ （Ｇｏｕｌｄ）生物学系列研究之一，报告了 １９８５年 ２月至 １９８６年 ２月福宁湾尖刀蛏生殖腺周年发育和组织学观察的初步结 果。性腺发育分４期：增殖期、成熟期、排放期、耗尽期。存在着雌雄同体和性变现 象。雌雄性比和性变与贝龄有一定关系。

The paper is one of the series researches on biology of Cultellum scalprum (Gould). It reports on pre- liminary research into the gonad development and the histology of Cultellum scalprum (monthly sample 80- 100 ind., total 1270 ind.) from February, 1985 to February, 1986 In Funing Bay, Fujian, China. The gonad development is divided into 4 stages: increase stage (from February to April and July to August); maturation Stage (at the last port of April till May and at the last pert of August till September); ovulation stage (at the last part of May till June and at the An Part of September till October); exhaustion stage (at November till January next year). This shell is reproductive vitality. It has appearance of hermaphrodition and sex reversal. The sex ratio and sex reversal concern their ages.