等边浅蛤Gomphina veneriformis的群体组成与生长

Growth and seasonal changes in size structure of clam, Gomphina veneriformis

本文据1987年12月至1988年12月逐月在舟山朱家尖岛沙滩采集的标本进行研究,结果表明,等边浅蛤Gomphina veneriformis壳宽、壳高和体重的生长,完全可以壳长表示;其补充群体出现于8月份,各年龄组在4～10月生长较快;肥满度和鲜出肉率在7～8月达最高值;6～9月是采捕期,但又是繁殖期,建议适量采捕或划出禁采区,以利保护资源。

Seasonal changes of the size composition and growth of clam Gomphina veneriformis (Lamarck), population in the intertidal zone of Zhujiajian Island (122°20′E,29°54′N) were studied. The samples were monthly collected during the period from Dec. 1987 to Dec. 1988. The size composition and growth rate were analysed by the method using probabilily paper based on the frequency distribution of shell length in each sample. The recruits appeared in August, in all age groups, the growth continued from Apr. to Oct.. The regression equations of shell length (L, cm) to shell high (H, cm), to shell wide (B,cm) and to total body weight (W, g) are below:L=0.0780+1.290 OH (r=0.9914)L=0.3199+2.4239B (r=0.9868)W=0.1916L^(3.0784) (r=0.9967)The precentage of drain body weight (=drain body weight/shell weight) and the precentage of fresh body weight(=fresh body weight/total weight) show regular variation. Beside, the method of age-determination and body water content are disscussed.