First record of freshwater invasive catfish, Clarias gariepinus (Burchell, 1822) in Dharamtar estuary, west coast of India.
African catfish, Clarias gariepinus (Burchell, 1822) is recorded, for the first time in Dol net, from Dharamtar estuary, West coast of India, in an attempt for sampling during October 2018 to February 2020 for documentation of ichthyofaunal diversity of the estuary. The species has been found to have enormous power of adaptation to survive in euryhaline conditions, especially estuarine conditions, which is a probable reason for its occurrence in the Dharamtar estuarine ecosystem. The present communication also deals with the comparative account on morphometry of fish and otolith of C. gariepinus and C. batrachus as a tool for confirmation of species. Otolith of C. gariepinus was observed to be three layered with 1.575431 elongation, 0.489 roundness, 25.672 circularity, 0.715 rectangularity, 0.490 form factor and 0.223431 ellipticity. The present investigation has generated baseline data on otolith for biological study.