Spawning migrations, sexual maturity and sex steroid levels in female roach Rutilus rutilus from the River Meuse. The status of sexual development of the ovarian tissue was assessed by determining the proportional area of each of six sections occupied by oocytes of each developmental stage. Detailed observations were made regarding their macroscopic appearance. Close mobile search navigation Article Navigation. The aim of this study was to begin this process by comparing sexual maturation and gamete production in populations of wild roach including intersex fish living in water courses that receive no treated sewage effluent with those living in rivers that receive treated sewage effluents. Asterisks on the main figures represent significant differences in concentrations between intersex fish or exposed females and pooled reference males or females, respectively. At all four sites, female fish had much lower KT concentrations below the reliable detection limit of the assay than either male or intersex fish Fig.
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