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长江口日本鳗鲡鳗苗时空分布特征

智玉龙1,2,侯俊利1,张涛1,章龙珍1,赵峰1,杨刚1,庄平1,2**   

  1. 1中国水产科学研究院东海水产研究所, 河口渔业生态与保护生物学功能实验室, 上海 200090; 2上海海洋大学水产与生命学院, 上海 201306)
  • 出版日期:2013-10-10 发布日期:2013-10-10

Spatiotemporal distribution patterns of elver (Anguilla japonica) in the Yangtze River Estuary of China.

ZHI Yu-long1,2, HOU Jun-li1, ZHANG Tao1, ZHANG Long-zhen1, ZHAO Feng1, YANG Gang1, ZHUANG Ping1,2**   

  1. (1Functional Laboratory of Ecology and Protection Biology of Estuarine Fisheries, East China Sea Fisheries Research Institute, China Academy of Fishery Science, Shanghai 200090, China; 2 College of Fisheries and Life, Shanghai Ocean University, Shanghai 201306, China)
  • Online:2013-10-10 Published:2013-10-10

摘要:

根据2012年1—4月在长江口东旺沙、佘山岛、青草沙、东风西沙、九段沙和南汇水域8个采样点的调查数据,研究了长江口日本鳗鲡鳗苗的时空分布特征。结果表明:2012年长江口鳗苗主汛期为2—3月,苗汛高峰时间呈现由南向北、由口外向内逐渐推迟的趋势,与其洄游路线一致;鳗苗主要分布区为长江口外的南汇、佘山岛、东旺沙水域,其中南汇水域产量最高,长江口内的青草沙、东风西沙水域产量较低;通过定点监测与问卷调查估算,2012年长江口鳗苗产量约1680万尾,产值5亿元左右;为实现长江口鳗苗资源的可持续利用,建议将捕捞期调整至2—3月,捕捞区域限制在南汇—佘山岛的长江口外水域。
 

 

关键词: 氮素矿化, 有机质分解, 蒙古栎, CO2浓度升高, 15N, 13C

Abstract: Based on the investigation data of anguillid elver (Anguilla japonica) at eight sampling sites in the waters of Dongwangsha, Sheshan Island, Qingcaosha, Dongfeng Xisha, Jiuduansha, and Nanhui of the Yangtze River Estuary in January-April, 2012, this paper studied the spatiotemporal distribution patterns of the elver in the Yangtze River Estuary. It was found that in 2012, the peak period of glass eel catch was from February to March, and gradually postponed from south to north and from the external to the internal of the estuary water. The spatiotemporal distribution patterns of the elver were accorded with its migrating route in the estuary. The main distribution areas of elver were the external waters of the Yangtze River Estuary, such as Nanhui, Sheshan Island, and Dongwangsha. Nanhui waters had the maximum catching quantity. Comparably, Qingcaosha and Dongfeng Xisha waters located inside of the estuary had lesser catching quantity. The fixedpoint monitoring and questionnaire surveys indicated that the total catch of glass eel in the Yangtze River Estuary was inferred nearly to 16.8 million individuals, with the output value being 50 million Yuan RMB. For the sustainable use of anguillid elver in the Yangtze River Estuary, it was suggested that the elver fishing time should be limited from February to March, and the elver fishing waters should be limited to the areas from Nanhui to Sheshan Island.

Key words: oak., 13C, nitrogen mineralization, elevated CO2, 15N, organic matter decomposition