Among the Clupeidae, the oil sardine, Sardinella longiceps, Valenciennes, 1847 dominates the catches of commercial boats in India. Despite two reports on isopod infection, no further information on parasitic crustacean infection on this fish species was available to date. Between June 2014 and April 2018, we examined 1513 specimens of S. longiceps, obtained from Cochin and Malabar Coast (Kerala, India) where we report for the first time the exclusive infection of this fish by the Lernaeopodid copepod, Clavellisa ilishae. This parasitic copepod was observed on the gill arches of the host collected from Malabar Coast; the specimens were all sexually mature females bearing egg sacs. Curiously, this copepod parasite was recovered only in a period of three months from October to December in the year 2017 even though the observation was continued for a total of 4 years from 2014-2018. This observation must be addressed further in terms of ecological impacts.

中文翻译：

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沙丁鱼，沙丁鱼，沙丁鱼上的足类（甲壳纲）感染，1847年（Actinopterygii； Clupeidae）-首次报道

在沙丁鱼科中，沙丁鱼，长沙丁鱼，瓦伦西亚（1847年）在印度商业船的捕捞量中占主导地位。尽管有两篇关于异足动物感染的报道，但迄今为止尚无有关该鱼类寄生甲壳类感染的进一步信息。在2014年6月至2018年4月之间，我们检查了从科钦和马拉巴尔海岸（印度喀拉拉邦）获得的1513个长头链球菌标本，我们首次报告了该鱼类被莱纳科足co（Lernaeopodid copepod）Clavellisa ilishae独家感染。在从马拉巴尔海岸采集的寄主的the弓上观察到了这种寄生co足纲动物；标本都是带有卵囊的性成熟雌性。奇怪的是，这种co足类寄生虫仅在2017年10月至12月的三个月内才被发现，尽管从2014-2018年总共观察了4年。必须从生态影响角度进一步解决这一问题。