长江上游宜宾江段渔业资源现状研究

发布时间：2018-01-03 23:31

本文关键词：长江上游宜宾江段渔业资源现状研究　出处：《西南大学学报(自然科学版)》2015年11期 　论文类型：期刊论文

【摘要】：为了解长江上游宜宾江段鱼类群落结构和渔业捕捞现状及变化趋势,为物种和资源保护提供依据,该文对宜宾江段的流刺网和小钩等主要作业渔具的渔获物进行了调查,对渔获物种类组成、捕捞规格和单位捕捞努力量渔获量等进行了统计分析.结果表明:在宜宾江段共采集到鱼类49种,隶属于3目10科29属,以鲤形目和鲇形目鱼类为主.圆口铜鱼、瓦氏黄颡鱼、异鳔鳅泙、宜昌鳅泙和蛇泩为该江段的优势种.采集到长江上游特有鱼类11种,占鱼类总种数的22.4%,其中一半以上的特有鱼类为偶见种.宜宾江段渔业捕捞规格普遍偏小,大部分捕捞个体体质量在100g以下,体长在150mm以下.该江段流刺网和小钩的单位捕捞努力量渔获量仅为每船1~2kg/d.宜宾江段渔业资源已严重衰退,许多特有鱼类变为偶见种,渔业捕捞渔获量偏低,捕捞规格偏小,建议采取休鱼等措施,促进物种和资源的保护.
[Abstract]:In order to understand the structure of fish community and the current situation and trend of fishery fishing in Yibin section of the upper reaches of the Yangtze River, it provides the basis for species and resource protection. In this paper, the catch of main fishing gear such as drift-gill net and small hook in Yibin River was investigated, and the species composition of catch was analyzed. The results showed that 49 species of fish were collected in Yibin River, belonging to 3 orders, 10 families and 29 genera. The dominant species were Cyprinidae and catfish. The dominant species were copper fish, Pelteobagrus vacobagrus varicobagrus varicobagrus varicobagneo, Loach seat and serpentine. 11 species of fish endemic to the upper reaches of the Yangtze River were collected. Accounted for 22.4 of the total number of fish species, among which more than half of the endemic fish species. Yibin River fishery fishing specifications are generally small, the majority of individual fishing weight is less than 100g. The body length is below 150mm. The catch per unit effort of Gill nets and small hooks in this section is only 1 kg / d per vessel. The fishery resources in Yibin reach have been seriously declined, and many endemic fish have become occasional species. In order to promote the protection of species and resources, the fishery catch is low and the fishing specification is too small.
【作者单位】：江汉大学生命科学学院;中国水产科学研究院长江水产研究所;
【基金】：国家自然科学基金(51109091,51310105036) 湖北省教育厅科学技术研究项目(B2013150)
【分类号】：S932.4
【正文快照】： 长江上游是我国淡水鱼类多样性最为丰富的地区之一,该江段分布有鱼类261种,其中特有鱼类112种[1].随着人类活动的加剧,长江上游鱼类资源面临着巨大威胁,过度捕捞、水利工程建设等对该江段鱼类带来了显著影响[2].为保护长江上游宝贵的珍稀特有鱼类资源及栖息生境,国家有关部门

【相似文献】