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首页> 外文期刊>Marine ecology progress series >Size variability and natural mortality dynamics of anchovy Engraulis japonicus eggs under high fishing pressure
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Size variability and natural mortality dynamics of anchovy Engraulis japonicus eggs under high fishing pressure

机译：高捕捞压力下En鱼卵的大小变异和自然死亡动态。

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摘要

Since the late 1990s, the anchovy Engraulis japonicus stock in the Yellow Sea has undergone considerable decline as a result of the enormous fishing pressure there. Reproductive characteristics have changed during the same period. Fisheries surveys were conducted in anchovy spawning grounds off south Shandong Peninsula in the Yellow Sea from 2000 to 2004, and in Laizhou Bay of the Bohai Sea, the wider Yellow Sea, and in coastal waters of the East China Sea from 2003 to 2008. Anchovy eggs from the spawning grounds south of the Shandong Penin sula (16 to 29 June 2003) had long axes ranging from 1.20 to 1.40 mm (1.28 ± 0.04 mm), and short axes ranging from 0.60 to 0.68 mm (0.64 ± 0.02 mm). In the coastal area of the East China Sea (7 to 14 May 2007), the eggs had long axes ranging from 1.12 to 1.40 mm (1.28 ± 0.06 mm) and short axes ranging from 0.55 to 0.68 mm (0.63 ± 0.03 mm). Compared with previous research results on anchovy egg size in Chinese waters and in other coastal regions of the North Pacific from the 1950s to 1970s, egg size was notably decreased both at the spawning grounds off the south Shan dong Peninsula and in the coastal waters of the East China Sea. The natural mortality rate of anchovy eggs was 80.15 % at the spawning grounds off south Shandong Peninsula, 77.63 % in the Yellow Sea, and 82.95% in Laizhou Bay of the Bohai Sea. Based on our survey data, the natural mortality rate of anchovy eggs has been as high as 80% in the Bohai Sea, the Yellow Sea, and the East China Sea since the late 1990s. Compared with survey results for the Yellow Sea from the 1980s, the natural mortality rates of anchovy eggs have shown a significant rising trend. The decreased size and significantly increased natural mortality rate of anchovy eggs are long-term adaptive responses, via the reproductive biology of the anchovy population, to the enormous fish ing pressure in the study area.
机译：自1990年代后期以来，由于那里巨大的捕鱼压力，黄海中的an鱼日本En种群已大大减少。同期，生殖特征发生了变化。 2000年至2004年，在黄海山东半岛南部的an鱼产卵场进行了渔业调查，2003年至2008年，在渤海，更宽泛的黄海的莱州湾以及东海的沿海水域进行了渔业调查。来自山东半岛苏拉（2003年6月16日至29日）产卵场的卵长轴范围为1.20至1.40 mm（1.28±0.04 mm），短轴范围为0.60至0.68 mm（0.64±0.02 mm）。在东海沿海地区（2007年5月7日至14日），卵的长轴范围为1.12至1.40毫米（1.28±0.06毫米），短轴范围为0.55至0.68毫米（0.63±0.03毫米）。与先前在1950年代至1970年代在中国水域和北太平洋其他沿海地区的cho鱼卵大小的研究结果相比，山东半岛南部南部的产卵场和南太平洋沿海水域的卵大小均明显减少。东海。在山东半岛南部产卵场，of鱼的自然死亡率为80.15％，在黄海为77.63％，在渤海莱州湾为82.95％。根据我们的调查数据，自1990年代后期以来，渤海，黄海和东海of鱼卵的自然死亡率已高达80％。与1980年代的黄海调查结果相比，an鱼卵的自然死亡率显示出明显的上升趋势。 size鱼卵的大小减小和自然死亡率显着提高是via鱼种群的生殖生物学对研究区域巨大捕捞压力的长期适应性反应。

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  • 来源
    《Marine ecology progress series》 |2012年第28期|243-251|共9页
  • 作者

    Ruijing Wan; Xiaodong Bian;

  • 作者单位

    Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), 106 Nanjing Road, Qingdao,Shandong 266071, PR China;

    Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), 106 Nanjing Road, Qingdao,Shandong 266071, PR China;

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  • 正文语种 eng
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  • 关键词

    egg size; adaptive responses; yellow sea;

    机译：鸡蛋大小;适应性反应;黄海;

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