三峡库区丰都江段鱼类早期资源现状

发布时间：2018-06-12 08:16

本文选题：三峡库区 + 鱼类早期资源　；参考：《水生生物学报》2015年05期

【摘要】：2014年4—7月鱼类主要繁殖季节于三峡库区(重庆丰都县)进行鱼类早期资源调查,以了解三峡库区鱼类早期资源现状,四大家鱼在库区是否仍有产卵场等问题。调查共采集到鱼类50种,分属5目9科。采集时,卵汛出现在6月后流速较高的时段,其中贝氏的数量最多,占86.24%。仔鱼出现的高峰期为6月上旬至7月中旬,太湖新银鱼的数量最多,占58.36%,其次为子陵吻虎鱼,占27.04%。在仔鱼中,种类组成呈明显的月份差异,4月鲤、鲫占数量优势;5月太湖新银鱼、子陵吻虎鱼占数量优势;6月后湆亚科、鳅科、鳜等种类开始出现,种类明显增多。通过估算,调查期间流经丰都断面的鱼卵总量为4.37×108粒,四大家鱼鱼卵为0.21×107粒;仔鱼总量为111.98×108尾,四大家鱼仔鱼为0.21×108尾。通过产卵场的推算,丰都断面采集的四大家鱼来自涪陵城区江段和三峡库区上游的重庆巴南区至朱沱镇江段的产卵场。通过对卵苗漂流密度的昼夜规律分析,6月之前夜间仔鱼密度显著高于白天,而6月后仔鱼昼夜漂流密度无显著差异。本研究表明,从三峡库尾进入三峡水库的鱼类早期资源丰富,大部分鱼类繁殖发生在6月以后水温较高、入库流量大、库区流速较高的时段,库尾部分江段在流速较高时期,仍存在四大家鱼的产卵场。
[Abstract]:In order to find out the present situation of fish resources in the three Gorges Reservoir area (Fengdu County, Chongqing) and whether there are still spawning grounds in the three Gorges Reservoir area, the main breeding season of fish in April-July 2014 is investigated in order to find out the present situation of fish resources in the three Gorges Reservoir area. A total of 50 species of fish, belonging to 5 orders and 9 families, were collected. The egg flood occurred in the period of high velocity after June, in which the number of Bayesian was the most, accounting for 86.24. The peak period of larvae was from early June to mid-July. The number of new silkfish in Taihu Lake was the most, accounting for 58.36, followed by Ziling Tigers, accounting for 27.04. In the larval fish, the species composition showed a significant monthly difference, April carp and crucian carp accounted for the dominant number; in May, the Taihu New Silverfish, Ziling Tigers were dominant; after June, the subfamily, Loach, Siniperca fish and other species began to appear, and the species increased obviously. It was estimated that the total number of eggs flowing through Fengdu section during the investigation period was 4.37 脳 10 ~ 8, 0.21 脳 10 ~ 7 for four domestic fishes, 111.98 脳 10 ~ 8 for larvae and 0.21 脳 10 ~ 8 for four domestic fishes. According to the calculation of spawning yard, the four domestic fish collected from Fengdu section come from the spawning yard in Fuling City and the upstream of the three Gorges Reservoir area, from Bannan of Chongqing to Zhutuo Town. Through the diurnal analysis of the drift density of egg seedlings, it was found that the density of larval larvae was significantly higher than that of daytime before June, but there was no significant difference in diurnal drift densities of larvae after six months. The results show that the early fish resources entering the three Gorges reservoir from the tail of the three Gorges reservoir are abundant, and most of the fish reproduction occurs in the period after June when the water temperature is higher, the inflow of the reservoir is large, the velocity of the reservoir is high, and the section of the river in the end of the reservoir is in the period of higher velocity. There are still four big fish spawning grounds.
【作者单位】：中国科学院水生生物研究所;中国科学院水生生物多样性与保护重点实验室;中国科学院大学;
【基金】：长江三峡生态与环境监测系统(JJ[2013]-10) 中国长江三峡集团公司科研项目(CT-12-08-01);中国长江三峡集团公司科研项目(0799522)资助
【分类号】：S932.4

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