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the male is provided with beautiful red, yellow and black spots and configurations on the body and often on the dorsal and caudal fins too; the caudal fin may also be elongated. The studies carried out on Lebistes concern the inheritance of the colour pattern and sex determination. Lebistes reticulatus has the male with XY and the female with XX. It was the first organism in which a Y-linked inheritance was demonstrated (Schmidt, 1920 Winge, 1921) ; two rather different colour patterns, Ir and Ma, were found on crossing two strains continually to be transmitted from father to son, grandson and so on, and never to be inherited X through the mother. Subsequently by thorough genetic analysis more than 20 fl colour genes have been demonstrated

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