绥芬河滩头雅罗鱼溯河生殖群体结构的探讨

AN APPROACH ON THE BREEDING POPULATION STRUCTURE OF LEUCISUS BRANDTI DURING MIGRATION IN SUIFEN RIVER

本文报道绥芬河鲤科唯一溯河性洄游鱼类滩头雅罗鱼生殖群体生物学。通过1,793 尾样品测定,对溯河期、产卵期、群体的年龄生长、体长体重、生殖力、性比、成熟系数、肥满度等主要生态学特征及种群数量作了研究。为开发、增殖这一稀有经济鱼类资源提供重要的生物学资料。

This paper deals with the breeding population biological characte-ristics of Leucisus brandti which is the only species of Cyprinidae during upstreammigration in Suifen River. 1793 samples were measured in 1989. The breeding po-pulation structure of L. brandti was as follows: (1) The population was consisted of 2--5 years old individuals, in which 3years old was 64.6%. The average body length of the fish was 293(225--425) mmand its average body weight was 450(175--1600)g. (2) The sex proportion was 1: 1.63.The fecundity was 34, 232 (15,222--88,660)eggs and the average diameter of eggs was 2.0(1.7--2.2)mm. The migrating sea-son was in May to June and spawning period was in middle May to early June. (3) The population was 30,000 individuals or so in 1989. Up to now,the popu-lation has greatly decreased. The ecological environment of spawning populationand spawning area should be protected. A Iarge scale artificial releasing of L.brandti should be adopted.