Fig. 1.

a Grouper fish Epinephelus undulosus collected form Therespuram, Tuticorin, Gulf of Mannar coast. b Parasitic isopod, genus Argathona attached body surface of a grouper fish E. undulosus

a Grouper fish Epinephelus undulosus collected form Therespuram, Tuticorin, Gulf of Mannar coast. b Parasitic isopod, genus Argathona attached body surface of a grouper fish E. undulosus