Abstract
Morphological and histological studies demonstrated that 17 α-methyltestosterone (MT) affects sex differentiation and can be used to control the phenotypic sex of pikeperch. Stizostedion lucioperca L. Treatment (for 21 days) of pikeperch (initially 2.2 g wet weight) with MT at 30 mg kg-1 diet induced germ cells inversion in approximately 46.67% of individuals (although 96.67% of the fish were classified as males). An increase in treatment duration (60 and 90 mg kg-1) increased the percentage of female, intersex and sterile fish. Slower growth rates of all the fish treated with MT in comparison to the control groups were demonstrated. However, no significant differences in conditions and mortalities between the MT treated fish and controls were observed.
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