EFFECT OF LSOPOD PARASITE JORYMA BRACHYSOMA ON LLISHA MELASTOMA FROM PARANGIPETTAI COASTAL WATERS (SOUTH EAST COAST OF INDIA)S. Ravichandran, A.J.A. Ranjit Singh, N. Veerappan and T. KannupandiAbstract The present study reported for the first time the effect of isopod parasite Joryma brachysoma infestation on Hisha melastoma a commercially important clupeid fish is reported from the partangipettai coastal environment. The loss of weight in host fishes (male 6.8 and female 9.0%) were observed due to parasitism. The weight of uninfested female fish was found to be higher than that of infested. The callus like thickening developed on the gill arch and gill filaments of host fish due to the constant irritation caused by the appendages of the parasite. The reduction of gill surface area was observed due to the attachment of the parasites. The maximum reduction observed the first gill arch is mainly due to the heavy pressure exerted by the parasite are also described. Details of gross lesions observed in the branchial chamber, buccal cavity and body surface were enumerated. The swimming capacity of the fish were also affected.
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