| 长江口刀鲚汛期特征及其资源状况的年际变化分析 |
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| 引用本文： | 田思泉,田芝清,高春霞,戴小杰.长江口刀鲚汛期特征及其资源状况的年际变化分析[J].上海海洋大学学报,2014,23(2):245-250. |
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| 作者姓名： | 田思泉 田芝清 高春霞 戴小杰 |
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| 作者单位： | 上海海洋大学,上海市渔政监督管理处,上海海洋大学,上海海洋大学海洋科学学院 |
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| 基金项目： | 上海市教委科研创新项目 |
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| 摘 要： | 刀鲚是长江水域重要的洄游性经济鱼类。根据2008-2011年捕捞汛期长江口刀鲚的观测数据,对刀鲚汛期特征及汛期体长、体重以及渔获量的年变化进行研究。研究结果表明:2008-2011年各年调查汛期内长江口刀鲚的体长分布均呈显著差异,2008年的优势体长组为26~38 cm,2009年的优势体长组为22~32 cm,2010、2011年的优势体长组为24~34 cm,2008年优势叉长组较其他年份大,2011年的体长均值小于其他年份;调查的汛期样本中,150 g以上的大规格刀鲚在群体中所占比例逐年下降,而50 g以下的小规格刀鲚比例逐年增加,刀鲚个体小型化趋势明显;汛期内长江口刀鲚单船每网的渔获量(CPUE)不断减少,2011年最低,相较2010年,其单船每网渔获量下降了95.5%;2008-2011年各年刀鲚的汛期特征基本表现一致,3月下旬至4月中旬进入刀鲚的旺汛期,捕捞产量较大。
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| 关 键 词： | 长江口 刀鲚 资源状况 CPUE 年际变化 |
| 收稿时间： | 2013/7/30 0:00:00 |
| 修稿时间： | 2013/9/30 0:00:00 |
Analyzing of annual changes for the stock status of Coilia nasus in fishing season in Yangtze River estuary |
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| TIAN Si-quan,TIAN Zhi-qing,GAO Chun-xia and DAI Xiao-jie.Analyzing of annual changes for the stock status of Coilia nasus in fishing season in Yangtze River estuary[J].Journal of Shanghai Ocean University,2014,23(2):245-250. |
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| Authors: | TIAN Si-quan TIAN Zhi-qing GAO Chun-xia and DAI Xiao-jie |
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| Institution: | Collge of Marine Sciences,Shanghai Ocean University,Division of Shanghai Municipal Fishery Supervision and Management,Shanghai Ocean University,College of Marine Sciences, Shanghai Ocean University |
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| Abstract: | As an economically important target species, anadromous Coilia nasus palys a role in both ecology and fishery in Yangtze River. According to the monitoring data collected by four study fleets in Yangtze River estuary, we analyzed the annual changes of the features and the stock status of C. nasus in the fishing season. The results indicated that there were significant differences in size distribution of C. nasus in Yangtze River estuary among the four year from 2008 to 2011. Furthermore, the mean fork length in 2011 was the smallest among these four years, and on the contrary, the dominant length in 2008 was 26 - 38 cm that was the greatest from 2008 -2011. Moreover, the percentage of the larger C. nasus （ W≥ 150 g） catch was dropping from 2008 to 2011 and that of the smaller C. nasus （W≤50 g） was increasing, which reflected that the miniaturization of C. nasus was evident. CPUE of C. nasus was decreasing by year in 2008 -2011 and the lowest CPUE occurred in 2011 which decreased by 95.5% compared to the CPUE in 2010. The peak fishing period usually started from late March to middle April with the high yield in each year based on the catch analysis. |
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| Keywords: | Yangtze estuary Coilia nasus stock status CPUE annual change |
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