长江流域资源与环境 >> 2021, Vol. 30 >> Issue (4): 861-868.doi: 10.11870/cjlyzyyhj202104009

• 自然资源 • 上一篇    下一篇

长江中游宜昌江段鱼卵时空分布特征研究

周  雪1,汪登强1,段辛斌1,刘绍平1,陈大庆1,郭  杰1,2,王  珂1*   

  1. (1.中国水产科学研究院长江水产研究所,湖北 武汉 430233;2.南京农业大学无锡渔业学院, 江苏 无锡 214081)
  • 出版日期:2021-04-20 发布日期:2021-05-17

Studies on Spatial and Temporal Distribution of Fish Eggs in the Yichang Section in Middle Reaches of the Yangtze River

ZHOU Xue 1, WANG Deng-qiang 1, DUAN Xin-bin 1, LIU Shao-ping 1, CHEN Da-qing 1, GUO Jie 1,2, WANG Ke 1   

  1. (1.Yangtze River Fisheries Research Institute, Wuhan 430233, China;2. Wuxi Fishery College NAU,Wuxi 214081,China)
  • Online:2021-04-20 Published:2021-05-17

摘要: 为了解长江中游宜昌江段鱼类早期资源现状,并探究漂流性鱼卵空间分布特征,于2018~2019年5~7月在长江中游宜昌江段进行了鱼类早期资源调查,同时对采集到的漂流性鱼卵进行空间分布差异性分析。结果显示,调查期间共采集鱼卵15 963粒,通过分子生物学方法共鉴定出漂流性鱼卵24种,隶属于1目3科,鱼卵优势种为鲢(Hypophthalmichthys molitrix),占总量的32.94%,其次是飘鱼(Pseudolaubuca sinensis)和草鱼(Ctenopharyngodon idellus),分别占30.80%、12.65%。2018和2019年平均鱼卵密度分别为5.61±9.72 ind./100 m 3,9.80±16.09 ind./100 m 3,不同种类鱼卵主要出现的时间也具有明显差异。差异性分析结果显示,宜昌江段鱼卵密度在空间分布上有显著差异(P<0.05),水平分布特征表现为江心(2018年为7.54±20.04 ind./100 m 3,2019年为13.15±25.49 ind./100 m 3)>南岸(2018年为6.20±7.92 ind./100 m 3, 2019年为9.25±14.12 ind./100 m 3)>北岸(2018年为3.07±4.71 ind./100 m 3,2019年为7.00±11.65 ind./100 m 3),垂直分布特征表现为中下层高于表层。该研究中获取的鱼卵在河流中的分布特征可为宜昌产卵场定位和产卵规模估算等提供数据支撑。

Abstract: An investigation was carried out at Yichang section in the middle reaches of the Yangtze River from May to July in 2018 and 2019 to study the status of early-stage fish resources of this river section. The survey focused on the spatial distribution abundance patterns of fish eggs by difference analysis. It turned out that the total of 15 963 eggs was collected. About 24 species of spawning drifting eggs in 4 families in 1 order were identified. The dominant species of fish eggs were Hypophthalmichthys molitrix (32.94% of the total numbers), followed by Pseudolaubuca sinensis (30.80%) and Ctenopharyngodon idellus (12.65%). In 2018, it was estimated that the average density for eggs was 5.61±9.72 ind./100 m 3. In 2019, there was 9.80±16.09 ind./100 m 3. There were significant differences in the main emergence time of different kinds of fish eggs. Difference analysis results showed that there were significant differences(P<0.05) between the drifting density of fish eggs in spatial distribution. In horizontal distribution, the highest density of fish eggs was found at the middle of river(7.54±20.04 ind./100 m 3 in 2018,13.15±25.49 ind./100 m 3 in 2019)and the density of fish eggs at the south of river (6.20±7.92 ind./100 m 3 in 2018, 9.25±14.12 ind./100 m 3 in 2019) was clearly greater than at north of river(3.07±4.71 ind./100 m 3 in 2018, 7.00±11.65 ind./100 m 3 in 2019). In vertical distribution, the density of spawn at surface layer was the lowest. The dispersal characteristics of the fish eggs in the river would be an important support for the study of the location of the spawning ground and the estimation of spawning scale in Yichang section.

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