INTERRELATIONSHIPS OF FRESH BODY WEIGHT AND TOTAL BODY LENGTH AND CONDITION FACTOR IN ADULT POMADASYS STRIDENS (FORSSKÄL, 1775) (FAMILY POMADASYIDAE) FROM KARACHI, PAKISTAN
Abstract
The length-weight relationship (LWR) and condition factor of adult Pomadasys stridens (Forsskäl, 1775)
samples (N = 192) collected during 2013 and 2014 from Karachi Coast was determined. The largest fish was
20.8 cm long and the heaviest fish was 69.0g in weight. The relationship between length and weight of adult P. stridens within the size range of length: 13.8 -20.8 cm was best given by a simple linear equation, W (g) = - 2.000 + 3.3621L (cm) ± 1.0194 (r = 0.9788; r 2 =0.9580; Adj. r 2 =0.9578; F = 43337.80 (p < 0.0001). The power equation W (g) = 2.8403.L (cm) 1.0467 ± 0.01888 (r = 0.9779; r 2 = 0.9562; Adj. r 2 = 0.9560; F = 4151.086 (p < 0.0001) was not better than the linear equation in explanatory power. The LW relationship didn’t follow the cube law and indicated a negative allometry between length and weight. The relative condition factor (Kn) averaged to 1.104 ± 0.003 varying from 0.9254 to 1.044 i.e. around 1.7% only). Like, Weight / Length ratio, it was significantly higher in pre-monsoon season. Kn positively associated closely with Weight /Length ratio of the fish.
