Hormonal Sex Inversion by 17α-Methyl testosterone in common carp (Cyprinus carpio) through egg Immersion Technique (IT)

Abstract

ABSTRACT The trial was conducted to evaluating the effect of different hormone concentrations of 17α-methyltestosterone @ (HC): (200, 400, 600, and 800 μg/L−1), immersion times (IT): 48, 60 and 72 h and the interaction effect of (HC × IT) on the hatching percentage of Cyprinus carpio egg, percent survival and percent of males. Results indicated that survival of treated fry was affected by the increasing IT (p < 0.001). The main interaction effect of HC × IT showed that the highest percent of male individuals 96% was attained at 800 μg/L HC at 72 h IT and lowest was recorded 49% in control (p < 0.05). Increased percent male of C. carpio was obtained with increasing HC across all IT. It is concluded that the immersion treatment at 800 µg/L for 72 h is more effective to change sex ratios of C. carpio. Masculinization of C. carpio by egg immersion is an alternative technique of oral method, manual sorting of sexes, gene manipulation and hybridization.