Abstract：The body color including eye color and fin shapes were statistically analyzed in filial generation from several ornamental swordtail fish (Xiphophorus helleri).The results showed that black color of the eyes was found to be controlled by dominant genes while the redness by recessive one. It was inferred from the observation above that the genetic regulation of body color was determined by quantitative trait genes when transparent one was hybridized with normal body color ones. The swallowtail was dominant in comparison with normal caudal fin in the fish.Furthermore,there were genetic correlations between the swallowtail trait and long anal fin trait for male swordtail fish. It was found that the high dorsal fin was controlled by dominant gene while the normal dorsal fin by recessive one.The genotype of swordtail fish with normal dorsal fin was recessive homozygote and high fin swordtail fish was heterozygote. However,the dominant homozygote was lethal genotype.
