Abstract
A new catfish of the genus Sisor Hamilton is described from the Barak River, a tributary of Brahmaputra River drainage in Manipur, India. Sisor barakensis sp. Nov., differs from its closest congener S. chennuah Ng, in having larger eye (14.6- 16.7% HL vs 9.9-11.4), narrower interobital distance (16.0-19.8% HL vs 22.1-22.7) deeper body at anus (6.3-7.2% SL vs 5.6-5.8), longer dorsal spind (10.5-14.3% SL vs 7.9-9.5) and pectoral spine (18.6-20% vs. 16.9-18.2) length, deeper caudal peduncle (2.2-2.3% SL vs 1.4-1.6) and more number of serrations (15-21 vs 10) on posterior the edge of pectoral spine.