An unusual swarm of Pleurobrachia pileus (O. F. Müller, 1776) was recorded in the Sundarban coastal waters of Bay of Bengal, Northern Indian Ocean during the winter monsoon season of 2018. The species occurred in the Sundarban waters with an average abundance of 6,766 individual m^-3 which in turn diminished the population of other zooplankton and fish. The hydrographical characters observed in the swarm stations favoured the proliferation of Pleurobrachia pileus and the unique factors were low temperature (18.9 – 20.9 °C), high salinity (~24 psu) and associated high biological production. The phenomenon of P. pileus swarm has not been reported earlier from the coastal waters of Sundarban, therefore, our incidental observation provides further insight to explore the study area.

中文翻译：

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在Sundarban的水域中存在大量的Ctenophore Pleurobrachia Pileus（OFMüller，1776年）：对渔业构成威胁吗？

不寻常的群Pleurobrachia菌盖（穆勒，1776）在2018年的冬季季风季节的物种发生在苏达班海域平均丰度的6766个人M被记录在孟加拉，印度洋北部湾的苏达班沿海水域^-3反过来减少了其他浮游动物和鱼类的数量。在群站观测到的水文特征有利于桩头菌的增殖，其独特因素是低温（18.9 – 20.9°C），高盐度（〜24 psu）和相关的高生物产量。P.pileus现象Sundarban沿海水域之前尚未报告过蜂群，因此，我们的偶然观测结果为探索研究区域提供了进一步的见识。