Research Article: Phenotypic and biological variations between the sexes of pike perch, Sander lucioperca (Teleostei, Percidae): Emphasizing sexual dimorphism

To phenotypically and biologically characterize the population of pike perch Sander lucioperca and to detect any potential variability between sexes, this study focused on analyzing sexual dimorphism and morphological differences based on morphometric and meristic characters, along with examining the length-weight relationships and condition factor. The growth type reveals positive allometry in both sexes. The Fulton’s condition factor (KF) value exceeded ۱ for both males and females, suggesting that the fish were in good conditions. No sexual dimorphism was found in the meristic characters of either sex. However, morphometric characteristics show that male individuals are distinguished by deeper bodies and extended pectoral and pelvic fins in comparison to females. The results of this study highlight six morphological differences between male and female Sander lucioperca, showing pronounced sexual dimorphism. These findings play a crucial role in the successful management and preservation of this species' population in Morocco, particularly in the Al Massira Dam Lake.

کلیدواژه ها:

Sander lucioperca ، Length-weight relationships ، Condition factor ، Sexual dimorphism ، Al Massira Dam Lake