广东北江上游南方拟个体生殖力的初步研究

STUDY ON INDIVIDUAL FECUNDITY OF PSEUDOHEMICULTER DISPAR (PETER) IN THE UPSTREAM OF BEIJIANG RIVER IN GUANGDONG PROVINCE

于2008年4月和2009年5月,在北江上游采集成熟度为Ⅳ期的南方拟雌性样本52尾,用质量法计数个体绝对生殖力（F）,计算出体长相对生殖力（FL）、体质量相对生殖力（FW）,并用5种数学模型及多元逐步回归方程拟合了个体生殖力与生物学指标的关系.结果表明：南方拟样本的个体绝对生殖力在1 636-8 579粒之间,平均为5 358粒;体长相对生殖力（FL）在182-547粒/cm,平均为402粒/cm;体质量相对生殖力（FW）在123-235粒/g之间,平均为176粒/g.个体绝对生殖力与全长、体长、鲜质量×体长、鲜质量、净鲜质量呈幂指数关系呈幂函数相关,与卵巢质量、成熟系数、丰满度、年龄呈抛物线相关.个体绝对生殖力与净鲜质量最为密切相关,相关式为：F=1 175.472＋135.557Wn.

This paper analyzes the individual fecundity and the relationships between individual fecundity and some biological indexes of Pseudohemiculter dispar（Peter） in the upstream of Beijiang River.The material for the study was collected from April 2008 to May 2009.52 specimens were studied,and the results are summarized as follows.The individual absolute fecundity（F） of Pseudohemiculter dispar varies from 1 636 to 8 579（average 5 358）eggs.The individual relative fecundity of body length（FL） ranges from 182 to 547（average 402） eggs/cm;the relative fecundity of body weight（FW） ranges from 123 to 235（average 176） eggs/g.The relationship between the individual absolute fecundity（F） and total length（TL）,body length（L）,body weight（W）,net body weight（Wn）could be described by power equation;and the relationship between the individual absolute fecundity（F） and mature coefficient（GSI）,ovary weight（Wo）,fullness（K）,age（t） can be regressed by quadratic equation.Multi-stepwise regressive analyses showed that the individual absolute fecundity are significantly related with net body weight（Wn）,with a regression equation of F=1 175.472＋135.557Wn.