author(s)
Syed Sikandar Habib, Saira Naz and Rafia Mehmood

abstract
The paper discusses about the morphometric relationships of certain species of family cyprinidae i.e. Labeo rohita, Cirrhinus mrigala, Catla catla and Cyprinus carpio. A total of nine morphometric measurements (Total length, Standard length, Fork length, Body depth, Head Length, Pre-dorsal fin length, Pre-pelvic fin length, Pre-pectoral fin length, and Pre-anal fin length) and body weight were noted. Basic descriptive statistical analysis and correlation coefficient (r) were analysis with total length (independent variable) and other morphometric measurements (dependent variable). The result presented that except pre-pelvic fin with total length in (Labeo rohita and Cyprinus carpio) and pre-dorsal fin with total length in (Cirrhinus mrigala and Catla catla) others all morphometric dimensions are highly correlated with total length. Also the regression coefficient (b) was less than 3.0 which indicated that all other morphometric dimensions compared with total length shows negative allometric growth and the body weight with total length shows positive allometric growth in (Labeo rohita = 3.260), negative allometric growth in (Catla catla = 2.100 and Cyprinus carpio = 2.400) and isomeric growth in (Cirrhinus mrigala = 3.016). The study represent that aquatic environment of Jinnah Barrage is appropriate for the growth of fishes.