Sea catfishes belong to the family Tachysuridae (Ariidae) and Plotosidae. Total 8 genera and 77 species are recorded in the family Ariidae of which 60 species of Arius spp. from Arabian Sea and Bay of Bengal. Four genera viz Arius/Tachysurus (Many species), Batrachocephalus (single sps.), Ancharius (two sps.) and Osteogenciousus (Single sps.) are known to occur in the western Indian Ocean.They inhabit marine and estuarine habitat and characterized by the presence of barbells, lack of true scales and strong spine in front of the caudal fin.Some aspects of biology and behaviour such as low...