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This study describes the length-weight relationships (LWRs) for Oreochromis niloticus and Notopterus notopterus, collected in 2006 and 2009 respectively from the Indus River, southern Punjab, Pakistan, with W = 0.0393 L 2.72 for O. niloticus and W = 0.0121 L 2.87 for N. notopterus. Negative allometric growth is indicated for both species.

Proximate composition of small catfish, Mystus bleekeri, from Nala Daik, Sialkot, Pakistan was investigated and fluctuation in relation to body size and condition factor was carried out. Mean percentages for water, fat, protein and ash contents in the whole wet body weight of wild M. bleekeri were 77.87, 3.26, 15.01 and 3.87%, respectively. Body composition of the fish was effected by body size; however, condition factor remains constant with observed body constituents (% water, fat, protein, ash and organic contents). Highly significant (P<0.001) correlation Found between percentage water and percentage fat, protein, ash and organic contents in both wet and dry body weight. Investigation of body size on body constituents Reflected decrease in relative amount of water, skeleton (wet and dry weight), increase in fat (dry weight), protein, organic contents (wet and dry weight), and no effect on fat (wet weight) with growth of fish. Additionally, the first reference for proximate composition for M. bleekeri is provided.

Length-weight relationships (W = a TL b ) were estimated for wild and farmed Tor putitora obtained from River Korang, Islamabad and Attock District, Pakistan, respectively. The results indicate, W = 0.0171 TL 2.85 for wild and W = 0.1000 TL 2.33 for farmed. Total length ranged from 18.0 to 40.2 cm for male and 31.6 to 37.0 cm for female wild Tor putitora, indicating that the fish are now much smaller. The first reference of length-weight relationships for Tor putitora is provided.

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