The aim of the study was to identify the dependence between the rearing indicators of European pikeperch, Sander lucioperca (L.), (body weight range 15-2000 g, age 0+, 1 +, 2+, 3+) reared in closed recirculating aquaculture systems (RAS) and fish sex. The study material was obtained from artificial reproduction, and the sex of the fish was determined after they were sacrificed. Fish body weight and body length, the body weight coefficient of variation CV, the K and Fulton coefficients of condition, and the hepatosomatic index HSI of males and females were similar in the analyzed fish size groups. Statistically significant differences between the sexes were noted in the absolute weight of the viscera in fish aged 3+ (female body weight = 2.1 kg; male body weight = 1.8 kg), which was 89.2 g (males) and 211.9 g (females) (P < 0.05). The values of VSI in this fish size class were significantly higher among females than males (14.3 and 10.1%, respectively) (P < 0.05). The results permit concluding that the potential development and implementation of production techniques for single-sex pikeperch populations might be economically justified and more advantageous for longer-term rearing of this species in RAS.
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