In this paper,the hybridization between Fugu rubripes and Fugu flavidus was carried out,and the early morphological characteristics and growth rate of hybrid progenies(F.flavidus ♀×F.rubripes ♂)were compared with the nonhybrids of the parents.The 5 cm length and 10 cmlength fingerling were collected for the comparison of morphological characteristics.The main differences are described as follows:(1) The color of tail fin which is light yellow in F.flavidus and black in F.rubripes’s,the hybrid is yellow with a little bit black,similar to F.flavidus.(2) The distribution of aculeus on the dorsum usually is not out of the lateral line,and never intersects with black spots even if it spreads in F.flavidus; in the case of F.rubripes,the aculeus spread over the lateral line and down to the abdomen,intersecting with the black spots; the acules in hybrid progenies were similar to those of F.rubripes,but did not spread to the abdomen.(3) The dorsal aculeus which extend to the line between two eyes in F.flavidus and to the line between two nostrils in F.rubripes,reach the place that between the eyes and nostrils in hybrid progenies.The discriminate function was established by two and four morphological variables at 5 cmlength and 10 cmlength respectively.The integrative identification is 96.8% and 100%.Thus,we could distinguish them by the color of tail fin and the distribution of aculeus in the stage of juvenile.After 110 days,the average body lengths of F.rubripes,the hybrid progeny and F.flavidus were(110.24±3.78) mm,(101.16±6.56) mm,and(82.92±4.29) mm,with the average body weights of(35.68±5.04) g,(33.00±6.24) g,and(20.99±3.00) g,respectively.The results revealed that the order of the three in both body length and weight is F.rubripes>hybrid progeny>F.flavidus,of which the hybrid progeny are 31.00%,57.22% higher than F.flavidus in the end of the experiment,There were significant differences between any two of them(P<0.01)based on analysis of variance and multiple comparison.The hybrid progeny exhibit significantly higher growth rate than that of F.flavidu and similar early morphology toF.rubripes, indicating a great deal of economic value and market potential.