长江上游珍稀特有鱼类国家级自然保护区干流江段圆口铜鱼资源现状及保护建议OA

Coreius guichenoti is an endemic fish species in the upper Yangtze River and was once one of the main e-conomic fish species in this region.In recent years,with the development of cascade hydropower projects throughout the upper Yangtze River basin,the distribution range of this species and its key habitats,such as spawning grounds,have sharply decreased,leading to a continuous decline in its wild population.To understand the resource dynamics and conservation prospects of Coreius guichenoti in the mainstream of the National Nature Reserve for Rare and Endemic Fish in the upper reaches of the Yangtze River,this study conducted a trend a-nalysis based on long-term fish resource monitoring data from 2007 to 2025.The results revealed that the catch per unit effort(CPUE),proportion in total catch weight,and occurrence rate of C.guichenoti in the mainstream of the reserve exhibited a significant phased decline.However,the average body length and weight of the cap-tured individuals generally increased.In the 2025 survey,fertilized eggs of C.guichenoti were discovered for the first time in the mainstream section of the Yangtze River within the reserve,confirming the formation of a new spawning ground in this reach.Given that the species is now capable of natural reproduction within the main-stem of the Yangtze River within the reserve,it was recommended to enhance the investigation and protection of its key habitats in this section.Furthermore,based on in-depth research into the ecological conditions required for its natural reproduction,large-scale stock enhancement,and the evaluation of its effectiveness,these activities should be continuously promoted to facilitate effective protection and population recovery of Coreius guichenoti within the reserve region.