Assessment of length-weight relationship, sex ratio and condition factor of common carp (Cyprinus carpio Linnaeus, 1758) in Lake Ziway, Ethiopia

Abstract

Lemma Abera, Abebe Getahun, Brook Lemma

The present study some biometric measurements (length-weight relationship, condition factor and sex ratio) were examined from 1950 specimens of Cyprinus carpio L. 1758 (Common carp) collected from Lake Ziway from October 2012 to September 2014. The maximum fork length was observed to be 48 cm in female and 45 cm in male. The relation between fork lengths (13 to 48 cm) and total weight (57 to 2500 gm) was curvilinear and represented as TW = 0.026 FL2.925, R2 = 0.899, P < 0.05. Fulton condition factor values (mean ± SE) varied from 1.49 ± 0.05 to 1.82 ± 0.04 for females and from 1.28± 0.04 to 1.59 ± 0.04 for males. Mean FCF (± SE) was found to be 1.63 ± 0.04 for the females and 1.41 ± 0.03 for the males. The overall mean FCF was 1.52 ± 0.01. Sex ratio was significantly different in size classes between 35- 39 cm (X2 = 25.14) and the overall female to male ratio was 1.1:1 (X2 = 4.154).