Environmental effect on growth of Chelon subviridis found in Indus River, Sindh-Pakistan

Environmental is one of the major factors effecting the growth of any living organism. Length-weight relation (LWR) and condition factor are the best measures to observe the growth condition and environmental effect on the growth of fish. Chelon subviridis is one of the species that move with water from marine to fresh water and faces environmental challenges to grow in a quite different variety of environment. In present investigation 200 specimens of Chelon subviridis were collected from Indus River near Thatta Sindh-Pakistan, about 100km from estuarine region. LWR was estimated by formulae w= aLb. The observed Weight (w) and Length (L) was found 54.053±5.5gm and 16.213±6 cm respectively. The intercept value (a) was calculated 0.11, while the exponent (b) was obtained 2.954. Further, condition factor was found as K=1.268. The present data reveals and ideal isometric growth in the freshwater while there is a little environmental effect. The present investigation suggests that the Chelon subviridis fish would be ideal for culture in the freshwater system.

کلیدواژه ها:

Chelon subviridis ، Condition factor ، Estuarine fishes ، Growth condition ، Length-weight relation.