Sexual dimorphism in the Chinese white fish hemiculter leucisculus

Divergent sexual selection in males and females can produce morphological and behavioural differences between the sexes. numerous hypotheses have been proposed for the wide variation in the brain size of the two sexes. the chinese white fish (hemiculter leucisculus) is a common small fish,which displays differences in reproductive behaviour of the two sexes. the males display nuptial coloration during mating season,whereas the females produce eggs. thus,the males may have larger brain size as a result of the divergent selection pressures hypothesis. results showed that the average body mass and gsi was greater in the female,whereas male fish had slightly bigger brain. gis and the relative brain size was larger in male than in the female. the male chinese white fish with larger brain size might perform elaborate behavior for attracting females,so to increase reproductive success,whereas,the females with smaller brain size might save expensive resources to support the production of eggs. © copyright 2016 zoological society of pakistan.