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ThesisItem Open Access Studies on the reproductive behaviour of Goldfish, Carassius auratus (Linnaeus), Black molly, Poecilia sphenops (Lesueur) and Swordtail, Xiphophorus helleri (Heckel)(CCSHAU, 2011) Sharma, Kavita; Gupta, R.K.Study of reproduction and reproductive behaviour is one of the basic criteria for the successful fish culture. Present study aimed to investigate the reproductive behaviour of live bearer viz black molly, Poecilia sphenops and swordtail, Xiphophorus helleri along with egg layer goldfish, Carassius auratus. Courtship behaviour shown by the males of black molly and swordtail was found to be same. Male showed mainly chasing, nipping, display and copulation attempt. Female showed rising and gliding behaviour. Further, size play a significant role as large size male in all the three species shows highest frequency of courtship behaviour. Female also spent maximum time in the vicinity of large sized males. During the present study for the breeding three different sex ratio of female and male was used. For the live bearer sex ratio used were 1:1, 1:2 and 2:1 and for the egg layer sex ratio used were 1:1, 1:2 and 1:3. Highest fecundity for black molly and swordtail was recorded in 1female: 2 male however for the goldfish highest fecundity observed in 1female:3 male. Fertilization and hatching percentage of eggs of goldfish was also highest in the sex ratio of 1female:3 male. Although breeding is most important but feeding also constitutes as major factor as growth of the fish depends on suitable feed. Present study further investigated the effect of different feed viz. pelleted, live and mixed on the growth performance of young ones/fry of molly, swordtail and goldfish. Highest weight gain and highest specific growth rate was found in the group fed with mixed feed followed by the live and pelleted for goldfish, black molly and swordtail. Water quality parameters as recorded regularly were in optimum range. The mixed diet promoted high food consumption and growth. Perhaps the variety in the diet stimulated appetite and the protein and nitrogen free extract components promoted growth. Problems associated with feeding dry diets include deterioration of water quality and tank cleanliness.