凤鲚瓯江种群的生物学特性

Biological Characteristics of Coilia mystus in the Oujiang River

2006年5–8月对浙南瓯江凤鲚的繁殖期生物学特性进行了调查和研究.结果表明,凤鲚瓯江种群汛期雌雄个体体重(W)与体长(L)的关系分别为Wf=0.021Lf2.52(R2=0.77)和Wm=0.0127Lm2.605(R2=0.72).个体绝对繁殖力在2836–62901粒之间,平均为(21112±8919)粒;绝对繁殖力(r)与体长(L)、体重(W)和纯重(NW)均呈线性正相关.相对繁殖力(r/L)与体长、体重呈线性正相关,平均个体相对繁殖力(r/L)为(1146±398)粒/cm;相对繁殖力(r/W)与体长、体重无关,平均个体相对繁殖力(r/W)为(657±186)粒/g.

The biological characteristics of Coilia mystus in the Oujiang River were studied and analyzed between May and August in 2006. The results were summarized as follows： The relationship between weight （W） and length （L） of female fish was Wf = 0.021Lf2.52 （R^2 = 0.77） and that of male fish was Wm = 0.0127Lm^2.605 （R^2 = 0.72）; the individual absolute fecundity of Coilia mystus was 2 836 - 62 901 eggs and the average was （21 112 ± 8 919） eggs; the individual absolute fecundity of Coilia mystus was positively related to the length, weight and net weight, while the individual relative fecundity r/L was positively related to the length and weight; average individual relative fecundity was （1 146 ± 398） eggs/cm; the individual relative fecundity r/W, which was not related to the length and weight, the average individual relative fecundity was （657±186） eggs/g.