文章摘要
长江下游苏通江段刀鲚(Coilia nasus)产卵场的初步研究
Preliminary study of Coilia nasus spawning grounds at Sutong section in the lower reaches of the Yangtze River
投稿时间:2020-11-23  修订日期:2021-02-03
DOI:
中文关键词: 苏通江段  刀鲚产卵场  鱼类早期资源  时空分布
英文关键词: Sutong Section  spawning grounds of C. nasus  The fishes of early life history stage  Spatial and temporal distribution
基金项目:国家重点研发计划(2019YFD0901205); 农业农村部物种资源保护项目(213013500804)
作者单位邮编
薛向平 上海海洋大学水产科学国家级实验教学示范中心 201306
彭云鑫 上海海洋大学水产科学国家级实验教学示范中心 
方弟安 中国水产科学研究院淡水渔业研究中心 214081
徐东坡 中国水产科学研究院淡水渔业研究中心 
王小豪 南京农业大学无锡渔业学院 
任可成 上海海洋大学水产科学国家级实验教学示范中心 
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中文摘要:
      长江下游苏通江段地处河口段,紧邻长江入海口,是长江洄游性刀鲚的必经洄游通道,近年来研究显示刀鲚成鱼资源仍呈现波动下滑的趋势,而刀鲚早期资源作为成鱼资源的补充群体,对此展开研究具有重要意义。为进一步揭示苏通江段刀鲚(Coilia nasus)早期资源的时空分布概况,本研究于2018~2020年每年5~8月对该江段累计进行84天的早期资源调查,调查期间共采集到刀鲚受精卵646枚,其中2019年采集到328枚,占总数的50.77%;其中在4月没有采集到刀鲚受精卵,5和6月采集到刀鲚受精卵的平均丰度均显著高于其它采集月份(P<0.05),各年份采集到刀鲚受精卵峰值分别出现在5月15日(4.96 ind/100m3),6月16日(26.48 ind/100m3),5月24日(26.11 ind/100m3)。Pearson相关性分析显示各采样断面空间分布存在显著性差异(P<0.05),平均丰度分布江右岸(1.42 ind/100m3)>江左岸(0.87 ind/100m3)>江心(0.69 ind/100m3);苏通江段下游S1(崇明岛绿华镇水域)和S2(海门市新通海沙水域)、中游S5(南通港闸区水域)和上游S8(如皋长青沙典园水域)采集到刀鲚受精卵的平均丰度和频次均显著高于其它采集断面(P<0.05);环境因子分析显示,刀鲚受精卵丰度与温度呈极显著负相关(P<0.01),在水温21.1~25.3 ℃、溶氧6.80~7.41 mg/L范围内采集到刀鲚受精卵的丰度较高。结果表明,5和6月为长江苏通江段刀鲚产卵高峰期,在水温21.1~25.3 ℃、溶氧6.80~7.41 mg/L范围内适宜刀鲚产卵,推测崇明岛绿华镇、海门市新通海沙、南通港闸区和如皋长青沙典园附近水域为刀鲚的潜在产卵场。
英文摘要:
      The Sutong section in the lower reaches of the Yangtze River is located in the estuary section and close to the estuary of the Yangtze River, which is the migration channel for C. nasus. In recent studies have shown that C. nasus adult fish resources still indicate a trend downwards. It’s of great significance to conduct research on C. nasus early resources, which is a supplementary group of adult fish resources. In this study, a total of 84 days of early resource surveys were conducted in Sutong section from May to August each year in 2018 - 2020 to reveal the spatial and temporal distribution characteristics of C. nasus early resources. A total of 646 fertilized eggs of C. nasus were collected during the survey period, including 328 eggs collected in 2019 accounting for 50.77% of all. The mean abundance of eggs collected in May and June was significantly higher than in the other months of collection (P<0.05), where no fertilized eggs were collected in April. The peak of fertilized eggs collected in each year was on 15 May (4.96 ind/100m3), 16 June (26.48 ind/100m3) and 24 May (26.11 ind/100m3), respectively. Pearson correlation analysis showed significant differences in the spatial distribution of the sampled sections(P<0.05), with mean abundance distribution on the right bank(1.42 ind/100m3) > left bank(0.87 ind/100m3) > centre of the river (0.69 ind/100m3). The mean abundance and frequency of fertilized eggs of C. nasus collected in the downstream S1(waters of Lvhua Town in Chongming Island) and S2(waters of Xintonghaisha, Haimen City), midstream S5(waters of Gangzha District in Nantong) and upstream S8(waters of Changqing Sha Dian Yuan in Rugao) of the Sutong section were significantly higher than those of other collection sections(P<0.05). The analysis of environmental factors showed that the abundance of fertilized eggs of C. nasus was negatively correlated with temperature(P<0.01), and the abundance of fertilized eggs of C. nasus was higher in the range of 21.1-25.3℃ and 6.80-7.41 mg/L of dissolved oxygen. The results showed that May and June were the peak spawning months for C. nasus in Sutong section, and the temperature range of 21.1-25.3℃ and dissolved oxygen range of 6.80-7.41 mg/L were suitable for C. nasus spawning. It’s hypothesized that the waters in Lvhua Town of Chongming Island, Xin Tonghaisha of Haimen, Nantong Gangzha District and Changqing Sha Diangyuan of Rugao are potential spawning grounds for C. nasus.
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