【摘要】 2005年4月对江段瓦氏雅罗鱼2只船渔获物234尾进行渔业生物学研究。捕捞群体平均体长16.6 cm(15～29.5 cm),平均体重151.4 g(50～300 g),年龄由1~+～5~+龄组成,2~+占36%；绝对生殖力为8050～12448粒/g,平均为3700粒/g；相对生殖力9. 04～100.6粒/g,平均为34.3粒/g；肥满度系数雌性为0.9436～2.0547%,平均为1.999%。雄性为1.4577～2.054%,平均为1.6262%。捕捞数量2005年春汛6.75 t。嫩江中游讷河江段瓦氏雅罗鱼资源呈现小型化、低龄化趋势；渔业资源呈下降趋势,亟待采取限定捕捞规格的保护措施。更多还原

【Abstract】 The fishery biology of Leucisus waleckii(Dybowski)based on 234 specimens in the middle section of nenjiang River in are studied in April and October 2003,the results are summarized as follows:In the Leucisus waleckii(Dybowski)population average individual full body length is 16.6±3.20 cm(interva115～29.5cm),average individual body weight is 151.4±26.43g(internal 50～300 g).Average age of Leucisus waleckii(Dybowski)is from 1~+ years old to 5~+ years old in the captured population,and 2~+ years old fish occupied 36.0%.The ripe age is 3~+ years old,and the body weight is more than 55g,the absolute fe- cundity of Leucisus waleckii(Dybowski)varies from 8050 to 12448 eggs with a mean of 3700 eggs,and the relative fecundity ranges from 9.04 to 100. 64 eggs/g with a mean of 34.3 eggs/ g,The fatness of famale fish ranges from 0.9436 to 2.0547% with a mean of 1.999%,and that of the male ones ranges from 1.4577 to 2.0507% with a mean of 1.6262%.the number of Leucisus waleckii(Dybowski)population is about 9.6 ton in the spring and about6.4 ton in the Autumn. As result shows above,the resources of this kind of fish in the middle reaches of nenjiang river is getting less and less quickly.更多还原