COMPARATIVE STUDY OF MORPHOMETRIC FEATURES OF BAGRID CATFISH Mystus dibrugarensis (CHAUDHURI, 1913), ASSAM; NE INDIA

The correct identification of a species is relevant. The present work was focused on description of Mystus dibrugarensis i.e. a highly localized fish species found in the upper Brahmaputra basin by using morphometric and meristic measurements. It belongs to the Bagridae family, distinctly differs from the other native variety of Mystus in the presence of two black spots; one at the base of the operculum and another spot at the caudal peduncle region. A distinct black mid lateral line connects the two spots. The caudal fin is forked and the upper lobe is longer and pointed than the lower lobe. Male possesses a distinct genital papilla whereas the female has a round genital opening in front of the anal fin.