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首页> 外文期刊>The Science of the Total Environment >Potential causative factors of noble scallop Chlamys nobilis mass mortality in Nan'ao Island, Shantou, China in 2017
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Potential causative factors of noble scallop Chlamys nobilis mass mortality in Nan'ao Island, Shantou, China in 2017

机译：2017年汕头汕头南岛南岛南岛南岛诺比尼斯大众死亡率的潜在造成因素

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摘要

Noble scallop Chlamys nobilis is an important marine bivalve that has been extensively cultured in the south coast of China since the 1980s. Unfortunately, since the late 1990s, the farmed scallops often suffered from regional mass mortality, which results in enormous economic losses to farmers and industries. In 2017, another mass mortality event occurred in Nan'ao Island, Shantou, China. In this study, the cause of C. nobilis mass mortality in 2017 was first investigated in the field, and then validated in a Laboratory experiment. In the field, three sampling sites were selected according to the scallop mortality rate: Hunter Bay (90% mortality), Baisha Bay (67% mortality) and Longhai (6% mortality). Meanwhile, environmental parameters (temperature, salinity, DO, pH and chlorophyll a) of each site were also measured in situ. Then, water and scallop samples were collected randomly for the analysis of phytoplankton diversity and algal toxin activity using 18S rDNA and PP2A inhibition assay, respectively. In Laboratory, healthy scallops were challenged with Karenia mikimotoi (1 × 10~3 cells/mL) for 30 h. The field results showed that no significant difference in those environmental parameters existed among the three sites, but the relative abundance of K. mikimotoi in seawater and scallops' intestines in Hunter Bay and Baisha Bay was significantly higher than that in Longhai, and sick scallops contained significantly higher algal toxin activity than healthy ones. Laboratory results revealed that challenged scallops with K. mikimotoi showed significantly higher mortality rate and algal toxin activity than healthy ones, and low density of K. mikimotoi (1 × 10~3 cells/mL) was sufficient to cause ＞50% scallops' mortality within 26 h. This study provides the first evidence that low K. mikimotoi cell density can cause massive mortality in C nobilis, and provides useful information as guide to prevent scallop mass mortality in the future.
机译：Noble Scallop Chlamys Nobilis是自20世纪80年代以来在中国南部海岸广泛培养的重要海洋双向二气。不幸的是，自20世纪90年代末以来，养殖扇贝经常遭受地区群众死亡率，这导致农民和行业的巨大经济损失。 2017年，汕头市南岛岛发生了另一个大规模死亡事件。在这项研究中，2017年首次在该领域研究了C. Nobilis大众死亡的原因，然后在实验室实验中验证。在本领域，根据扇贝死亡率：猎人湾（90％死亡率），白石湾（死亡率）和龙海（6％死亡率），选择了三种取样网站。同时，也以原位测量每个部位的环境参数（温度，盐度，pH和叶绿素A）。然后，随机收集水和扇贝样品，分别使用18S rDNA和PP2A抑制测定分析浮游植物分集和藻类毒素活性。在实验室中，健康的扇贝用Karenia mikimotoi（1×10〜3个细胞/ ml）挑战30小时。该领域的结果表明，这三个地点中存在的环境参数中没有显着差异，但亨特湾和白沙湾海水和扇贝肠道的K.Mikimotoi的相对丰度明显高于龙海，而病的童子藻类毒素活动明显高于健康的活性。实验室结果表明，具有K.MikimotoI的挑战性扇贝表现出比健康的毒率和藻类毒素活性显着更高，并且K.Mikimotoi（1×10〜3个细胞/ ml）的低密度足以引起> 50％的扇贝死亡率在26小时内。本研究提供了第一种证据，即低K.Mikimotoi细胞密度会导致C Nobilis中的大量死亡率，并提供有用的信息作为预防未来扇贝大规模死亡率的指南。

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  • 来源
    《The Science of the Total Environment》 |2021年第10期|142268.1-142268.9|共9页
  • 作者

    Ting Ye; Karsoon Tan; Hongkuan Zhang; Huaiping Zheng;

  • 作者单位

    Key Laboratory of Marine Biotechnology of Guangdong Province Institute of Marine Science Shantou University Shantou 515063 China;

    Key Laboratory of Marine Biotechnology of Guangdong Province Institute of Marine Science Shantou University Shantou 515063 China;

    Key Laboratory of Marine Biotechnology of Guangdong Province Institute of Marine Science Shantou University Shantou 515063 China;

    Key Laboratory of Marine Biotechnology of Guangdong Province Institute of Marine Science Shantou University Shantou 515063 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Noble scallop; Chlamys nobilis; Mass mortality; Karenia mikimotoi; Algal toxin; Environmental parameter;

    机译：高贵的扇贝;Chlamys Nobilis;大众死亡率;Karenia mikimotoi;藻类毒素;环境参数;

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