长江三峡库区鱼类资源现状的研究

1997－2000年在长江三峡库区的巴南和万州江段共监测1292船次，统计 渔获物4096．38kg，生物学测定2464尾，共采集鱼类30种，分属8科24属，目前库区渔获物组成和结构与20世纪70年代相比发生了较大变化，白甲鱼，中华倒刺靶，岩原鲤等在渔获物中比较已经很少，铜鱼资源也明显下降，Gua，Gan，鳊等在渔获物中已基本消失，而南方鲇，鲤，黄颡鱼等比较相对上升，渔获物中高龄鱼个体减少，低龄鱼及幼鱼个体比重增加，与70年代资料相比，三峡库区鱼区资源已呈衰退趋势。

STUDIES ON STATUS OF FISHERY RESOURCES IN THREE GORGES RESERVOIR REACHES OF THE YANGTZE RIVER

From 1997 to 2000, a survey on the fishery status was taken in Banan and Wanzhou sections in the Yangtze River. A total of 1292 boats were investigated, 4096.38kg fish were captured and 2464 tails of fish were measured. Fishes of 8 families, 24 genera and 30 species were collected. In comparison with the data gotten in 1970s, the catch species and composition had changed much recently. The abundance of Varicorhinus (Onychostoma) simus (sauvage et Dabry,) Barbodes (Spinibarbus) sinensin (Bleeker), Procypris rabaudi (Tchang) and Coreius heterodon (Bleeker) had been decreasing. Some fishes such as Ochetobius elongatus (kner), Plagiognathops microlepis (Bleeker), Elopichthys bambusa (Richardson), Parabramis pekinensis (Basilewsky) had disappeared. While the number of Silurus soldatovi meridionalis Chen, Cypprinus carpio Linnaeus and Pseudobagrus fulvidraco (Richardson) had been increasing. In catches, the number of low aged fish had been getting more and high aged fish getting less, which shows the fishery resources in the Yangtze Three Gorges Reservoir Region is declining, and the main reason is overfishing.