Length‐weight relationship (LWR) parameters were analysed for six demersal finfish species from the Gulf of Mannar coast, Bay of Bengal. Fishes were sampled monthly from the landings of trawlers operated along the coast of Tuticorin and Rameshwaram with a cod‐end mesh size of 35 mm at the depth of 60–80 m. Fish specimens were sampled by measuring the total length (TL) and total weight (TW) with precision to 0.1 cm and 0.1 g respectively. The present study also recorded a new maximum total length for Engyprosopon macrolepis, Torquigener brevipinnis and Leiognathus brevirostris.

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A single female specimen of jawfish Opistognathus evermanni (Perciformes: Opistognathidae) was recorded with the standard length of 73.17 mm from Mudasal Odai fish landing centre, along Parangipettai coast, Southeast coast of India. Opistognathus evermanni possesses X + 12 dorsal spine and rays by the head are large, its width greater than that of body and uniformly pigmented, gill rakers are very long and slender, 10 + 20 found on first arch. Spinous dorsal fin, Caudal and anal fins are which are also very dark in coloration and possess two white stripes. The species O. evermanni locality was previously known only from the coastal waters of Japan. The present study reports the first record of O. evermanni along the Southeast Coast of India that found a new addition to the Indian coastal ichthyofauna.