[Objective] The stydy aims order to be able to understand the current situation and effectively protect the fish resources of South River of Xinjin,and to provide some theoretical basis for ecological research of minjiang river.[Method] Fish stocks and diversity index in south river in Xinjin aquatic area were investigated and analyzed in four different season from 2014 to 2015,throughout employing the local fishery man to help catch the fish under getting the permit from government.[Result] According to the survey,results showed that total 34 species of fish were investigated,which were classified into 5 orders and 10 families.For the proportion of fish species,the main species were the Cypriniforrnes family,the proportion up 55.8 ％.they were considered as the majortity in South River.The second higher proportion were Siluriformes family,the total of the fish was 10 species,accountingfor 29.42 ％.Then,a minimum of proportion was Percirmes family,the total fish was just three species,accounting for 8.82 ％.For the other families,Acipenseriformes and Synbranchiformes,there were just one species for each class.The results from species identification and proportion analysis showed that some economic fish were the main species in investigated river area,such as common carp,crueian carp.The results also showed that the aquatic biodiversity was relativelyabundant in South River basin.The Shannon-Winener diversity index(H) was higher in summer (2.138) than in autumn (1.956).Marvellously,some introduced species were also collected in all sampled points,which might be introduced into farm pond for fish culture and escaped into the natural aquatic ecosystem because of fish farmer's negligence,such as Oxyeleotris marmorata,colored crucian carp and Trachemys scripta elegans.The difference species of fish were catch in different seasons.Moreover,the number of fish species was higher in summer than in winter.And there were significant characteristics of fish in three sample points.In Yongxing town,the specics mainly was the Cyprinidae family,such as Abbottina rivularis;a large number of economic fish were collected in the last sample point,the New Nanhe Bridge,such as common carp and crucian carp.This could be explained for the establishment of fish conservation area.In addition,some release species were found in the Guanyin temple sample point,such as.the color crucian.[Conclusion] In conclusion,a significant protected affect was found in the river area of Establishment for fish resources protection,and in order to avoid aquatic organism escaping and bio-invasion,more attention should be pain to both fish stock introduction for aquaculture and fish release,which need to scientific management and guidance.%[目的]为了解南河新津段流域生境现状并对其水域内鱼类资源进行有效保护,为岷江支流水域生态研究提供理论依据.[方法]2014年10月至2015年9月,分别于9月,11月,4月和7月4次对南河新津段水域进行鱼类资源调查,通过雇佣当地渔民,在3个采样点进行现场捕鱼,将渔获物带回实验室,进行业内鉴定.根据调查结果结合流域生境现状进行综合分析并提出有关建议.[结果]4次共采集鱼类34种,隶属5目、10科、28属.从鱼类种类比例上看,鲤形目种类最多,共19种,占南河河段鱼类种教的55.88％.鲇形目10种,占鱼类种数的29.42％,鲈形目3种,占鱼类种数的8.82％.鲟形目和合鳃鱼目均各有1种,占鱼类种数的2.94％.在渔获物中,经济鱼类如鲤鱼、鲫鱼等所占比例最高,是南河流域优势种.南河流域鱼类多样性较为丰富,夏季香农多样性指数为2.138,高于秋季香农多样性指数(1.956).在前两个采样点中采集到云斑尖塘鳢、彩鲫及巴西红耳龟等养殖逃逸种.不同季度之间的渔获物组成差异较为明显.各个采样点夏季鱼类种数较高,而冬季鱼类种数最低.且在不同采样点,渔获物组成也存在明显差异,其中永兴镇主要以棒花鱼等小型鲤科鱼类为主;新南河大桥采样点靠近城镇,由于水域保护区的建立,因此该点鱼类种类较多且以个体较大的大型经济鱼类为主,如鲤、鲫等;而观音寺则出现放流种彩鲫.[结论]说明保护区的建立对鱼类资源保护具有显著作用,人工放流需要科学管理和引导,同时务必关注新品种的引进与选逸控制.
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