Breeding Ratio Management and Reproductive Success in Three Major Aquaculture Species of Nigeria: Clarias gariepinus, Oreochromis niloticus, Cyprinus carpio

Abstract

Breeding ratio is a critical determinant of reproductive success, seed yield, and genetic stability in aquaculture systems. This study evaluates optimal male-to-female ratios in hatchery operations for selected aquaculture species, with emphasis on African catfish (Clarias gariepinus), Nile tilapia (Oreochromis niloticus), and common carp (Cyprinus carpio). The assessment was conducted through hatchery-based evaluations and review of existing literature. Results indicate that artificial fertilization systems benefit from skewed ratios (1♂:2–3♀), while natural spawning systems perform optimally at balanced or moderately skewed ratios (1♂:2♀) to minimize competition and maximize fertilization. Excessive male dominance was linked to reduced spawning success and stress, whereas insufficient males led to poor fertilization. The study concludes that species-specific, system-based ratio management, supported by genetic monitoring, is essential for maximizing aquaculture yield and sustainability.