Condition, length-weight and length-length relationships of the Asian striped catfish Mystus vittatus (Bloch, 1794) (Siluriformes: Bagridae) in the Mathabhanga River, southwestern Bangladesh

The present study describes the annual condition as well the length–weight (LWR) and length–length relationships (LLR) of the Asian striped catfish, Mystus vittatus (Bloch, 1794) (Siluriformes: Bagridae), an important fishery in the Mathabhanga River (SW Bangladesh). A total of 2438 specimens (3.60–9.60 cm standard length) used in this study was caught with traditional fishing gear from January to December 2004. Overall, the allometric coefficient b of the LWR was close to the isometric value (b = 3.058), although it suggested negative allometric growth for males (b = 2.959) whilst positive allometric growth for females (b = 3.134). The results further indicated that the LLRs were highly correlated (r2 > 0.989, P < 0.001). The monthly gonadosomatic index showed that the…