Sex population structure of Macrobrachium felicinum and Macrobrachium vollenhovenii in the Akor river, Ibere Ikwuano, Abia State

Abstract

Akor River Ibere was sampled for 24 months during September 2012 – October 2014 using the Area density method. The river was delineated into three stations for sampling purposes namely Station A, B and C. Station A is located at Obuoro, Station B is located at Elemaga while Station C is located at Itunta where the prawns were all collected from. In the three stations, females predominated over the male with overall prawn species of 4,859 individuals out of which 3302 were females and 1551 were males giving a ratio of 1:2.07. A total number of 1,239 Macrobrachium felicinum were caught out of which 370 individuals were males and 869 individuals were females giving a ratio of 1:2 which was significantly different (p0.05) though a ratio of 1:1 is expected. There were significant differences in number of shrimps caught between seasons (p