Occurrence, morphology and molecular characterisation of Bopyrid parasite Epipenaeon ingens Nobili, 1906 (Isopoda: Bopyridae).

Epipenaeon ingens occurs most commonly in Southeast Coast of India parasitized the penaeid shrimp. The present study provides the prevalence, morphological and molecular characterisation of E. ingens collected from the host Metapenaeopsis stridulans. In the present study highlights the significance of high prevalence and genetic diversity of E. ingens in M. stridulans. Intra specific analysis also revealed that E. ingens species detected in the present study can be easily distinguished from the other genospecies of bopyrids. Further application of this molecular tool to investigate the genetic variability among bopyrids detected in different hosts may facilitate our understanding of the significance of genetic diversity in relation to the infestation of bopyrid species in south coast of India.

High prevalence and infestation of Mothocya renardi (Isopoda, Cymothoidae) in marine fish Strongylura leiura (Bleeker 1850).

Cymothoid isopods are parasites that cause severe damage to the fish species. The present study was focused to carry out the parasitic infestation on the one of the important marine fish Strongylura leiura during the 2 years period between June 2009 and May 2011. 272 fish specimens collected and about 157 (57.72 %) fishes were infested by the cymothoid which were concealed under the gill arches of the host. Infested parasite was identified as Mothocya renardi. The prevalence rate of parasites during different seasons of the range of host specificity of isopods was studied. Variation of infestation rate also depends on the size, length and weight of the host. The sites of infestation by the parasitic crustaceans are highly specific. The infestation had affected the normal growth of the host fish and also probably leads the high levels of secondary infections.