Some reproductive aspects of the areolate grouper, Epinephelus areolotus from the Gulf of Suez

Abstract

Groupers are primary targets of artisanal, recreational and commercial fisheries in the Red Sea and Gulf of Suez. The reproductive biology of the areolate grouper Epinephelus areolatus, collected from the main landing site in the Gulf of Suez, was investigated, and females accounted for 87.2% of the total fish sampled for a 1:6.8 male to female sex ratio. The monthly analysis of gonado-somatic index values and the monthly distribution of maturity stages showed that the spawning season of E. areolatus was restricted to the period from June to August for both sexes. The length at which 50% of the fish were mature was 24.3 cm for males and 25.5 cm for females, and by referring this value to the corresponding age, it was determined that E. areolatus first attains sexual maturity at 2.04 years for males and 2.23 years for females. The species was characterized by high fecundity, with a mean of 169,952 to 1,433,022 ova per female, and the relative fecundity ranged from 7,081 to 32,569 ova for individuals with a total length between 24.0 and 44.0 cm. The results of this investigation can be utilized to develop suitable management practices for groupers and for planning appropriate control measures.