北部湾及附近海域栉江珧性腺发育研究

通过对北部湾及附近海域栉江珧性腺进行周年切片观察，根据生殖细胞发育状况和各类型细胞在滤泡中所占的比例，将栉江珧性腺发育过程分为增殖，生长，成熟，排放和休止５个月。观察发现雄性性腺发育过程吕性细胞呈现区域性同步化分布特征；雌性性腺的不同部位发育程度也有一定差异。造成性腺分批在熟排放。湛江附近海栉江珧在５月和１０月形成两个繁殖高峰期，休止期不明显，切片中还观察到少量栉江珧个体存在雌雄同体现象。

The Gonad Development of Pinna (Atrina) pectinata in Beibu Gulf and Adjoining Coast

Seasonal changes in the gonad development of the pen shell, Pinna (Atrina) pectinata , in Beibu Gulf and adjoining coast were examined on the basis of histological observation. The male germ cells at similar differentiated stage were arranged in same area of the follicle and the development of different parts of the gonad were unequal.According to the cytological characteristics and the relative amounts of the developing sexual cells in the follicle, the phases of gonad could be divided into five stages: proliferating stage, growing stage, maturing stage, spawning stage, resting stage. The spawning stage was from May to November with two spawning peaks. The first peak in May was followed by the second in October. The maturation of the gonads and the spawning period of Pinna (Atrina) pectinata are closely related to temperature of seawater. Hermaphrodites observed suggest the possibility of sex reversal from male to female,or vice versa.