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Turkish Journal of Fisheries and Aquatic Sciences 2018, Vol 18, Num, 3     (Pages: 445-455)

Caligus cybii (Caligidae, Copepoda) parasitising the commercially exploited seer fish, Scomberomorus commerson, from the Malabar Coast (India)- occurrence and adaptations

Ameri Kottarathil Helna 1 ,Kappalli Sudha 1-3 ,Panakkool-Thamban Aneesh 1 ,Gopinathan Anilkumar 2

1 Post Graduate Department of Zoology and Research Centre, Sree Narayana College, Kannur 670 007, India
2 School of Biotechnology, Chemical and Biomedical Engineering, VIT University, Vellore 632014, India
3 School of Biological Sciences, Central University of Kerala. Kasaragod 671316, Kerala, India
DOI : 10.4194/1303-2712-v18_3_10 Viewed : 382 - Downloaded : 323 The paper presents a first time report on the host specific parasitic occurrence of copepod, Caligus cybii, on the barred seer fish, Scomberomorus commerson distributed along the Malabar Coast, India. Of 81 fish species belonging to 35 families examined during the period from Jan 2012 to Jan 2014, only S. commerson was parasitised by C. cybii. 361 individual host fish examined, 80 were found to be infested (P= 22) with a total of 162 sexually dimorphic male and female of C. cybii (I= 2.02). Significantly, high degree of disproportion in the sex ratio of the recovered members of C. cybii was found existed inasmuch as more than 91% (148 out of 162) of them were reproductively active females. Invariably, all of them were found attached the inner epithelial lining of the operculum of the host signifying the strict site specific parasitisation. Light and scanning electron microscopic study showed the presence of structurally and functionally specialised mouthparts and appendages suited for their parasitic existence was evidenced by the present light and scanning electron microscopic studies. The present paper also discusses the damage found in the epithelial tissue of the host fish likely due to parasitisation. Keywords : Parasitic crustaceans, prevalence, intensity, host specificity, site specificity