Length-weight Relationships for Nine Freshwater Teleosts Collected from River Ganga, India

摘要

The Length-Weight Relationships (LWRs) of fish were studied covering six families and nine species ( Bagarius bagarius , Sperata aor , Channa striatus , Clarias batrachus , Sperata seenghala , Wallago attu , Hypophthalmichthys molitrix , Labeo rohita and Catla catla ) collected from the river Ganga during the period from January 2010 to June 2011. A total of 1827 specimens were used to estimate the length-weight relationship parameters. Estimates of b ranged from minimum of 2.586 for C. batrachus to a maximum of 3.249 for S. aor ; two species ( B. bagarius and W. attu ) showed isometric growth (b = 3), three species ( S. aor, L. rohita and C. catla ) showed positive allometric growth (b>3), while four species ( C. batrachus , C. striatus , S. seenghala and H. molitrix ) showed negative allometric growth (b<3). The r2 value ranged from 0.91 to 0.99. One maximum length ( H. molitrix ) was new to science against FishBase.