Study of some Reproductive Characteristics of Cyprinus Carpio (L., 1758) from Main Outfall Drain in Al-Qadisiyah City, Iraq.

Abstract

Sex ratio and gonadosomatic indices of fish give important indexes about the reproductive biology for the species. This study was conducted to investigate the reproductive dynamics of the common carp (Carpio Cyprinus) species in the DMO, middle Iraq, for a period between January and December 2017. Where the sex ratio, fecundity and gonadosomatic index (GSI) were assessed and calculated throughout the year. Fish samples were captured by using the different fishing traditional methods to get all the sizes without bias. Total mean of the female to male sex ratio was 1:1.22 and ranged from 1:0.67 in December to 1:1.75 in April. The highest average of fecundity was for the female and male at the age of 3 and 2 years respectively. The monthly combined values of GSI for both sexes indicated that the peak breeding season to the species of C. carpio occurred in February in the study area and lowest in the female and male in August and July, respectively. This study provided a baseline assessment of the case of reproduction to the species of C. carpio to contribute to the evaluation of the potential long-term consequences for this species of fish.