对秦岭西段汉江水系和嘉陵江水系的鱼类和环境调查显示 ,人类活动对鱼类多样性产生了较大的影响。本文试图对该地区鱼类多样性丧失的现状加以报道并对原因进行分析。以前该地区鱼类共有 142种 ,本次调查的渔获物中只有 34种。鱼类物种资源的减少是多种因素造成的 :水坝的修建使得鱼类栖息地环境改变从而导致鱼类的种类和种群数量变化 ,水污染、过度捕捞和非法渔业也在一定程度上破坏了鱼类物种多样性。 Fish and environmental surveys of the Hanjiang River system and the Jialing River water system in the western part of Qinling have shown that human activities have a large impact on fish diversity. This paper attempts to report on the status of fish loss in the area and to analyze the causes. There were 142 species of fish in the area before, and only 34 species were included in this survey. The reduction of fish species resources is caused by a number of factors: the construction of dams has led to changes in the habitats of fish species resulting in changes in the species and population of fish species, and water pollution, overfishing and illegal fisheries have also destroyed fish to some extent Species diversity.