Length-weight Relationship and Condition Factor of Five Carp Species from Keenjhar Lake, District Thatta, Sindh, Pakistan

Abstract

: In current investigations on the relationship of length and weight of 5 carps were presented, total 256 fish were caught between September 2016 and August 2017 from Keenjhar Lake District Thatta, Sindh. Cyprinus carpio were 77 out of which 50 males and 27 females, with total length ranging from 34.3 to 36.6 cm 33.7 to 37.4 cm respectively, Labeo rohita were 75, 45 males and 30 females with total length ranging from 32.0 to 39.0 cm, and 40.9 to 45.7cm respectively.Cirrhinus mrigala was 45 out of which 20 males and 25 females, with a total length ranging from 41.3to 43.2 cm, and 43.4 to 46.6 cm respectively. In case of Hypophthalmichthys molitrix the total number was 33 which of 15 males and 18 females with the total length ranging from 39.3 to 41.9 cm and 42.3 to 44.2 cm respectively and 26 were Catla catla 14 males and 12 females with total length ranging from 33.7 to 36.2 cm from 42.5 to 44.9 cm respectively.The length weight relationships andcorrelation of co efficient was analyzed for either sex separately. In the present studies values of b varied from 3.11 and 2.81 male and female of Cyprinus carpio, forLabeo rohita 2.79 and 2.65 respectively,3.94 and 2.87 male and female of Cirrhinus mrigalaof the b value of Hypophthalmichthys molitrix in male 2.85 and 2.65 in female for Catla catla in male and female 2.70 and 2.77.Calculated coefficient of condition in Cyprinus carpio found to be 1.04, 0.94 in male and female respectively, Labeo rohita 0.97, 1.17 for male and female respectively, in Cirrhinus mrigala found to be 1.07, 0.98 in male and female respectively, for Hypophthalmichthys molitrixand Catla catla 0.89, 0.91, 0.93, and 0.97male and female respectively. The studies reveled that Cirrhinus mrigala showed better growth and pursued cube law (b=3.94) followed by Cyprinus carpio (b=3.11) while Labeo rohita (b=2.79) and Catla catla (b=2.70) exhibited closed to ideal and Hypophthalmichthys molitrix showed poor b values (b=1.85). L/W values and coefficient of condition showed ideal growth of five carp species from Keenjhar Lake, District Thatta, Sindh, Pakistan.