Fluctuating asymmetry has been widely used as a measure of developmental stabilityÂ and as an indicator of individual fish growth. The present study compared fluctuatingÂ asymmetry in three bilateral meristic traits of F-1 hybrid between female EpinephelusÂ fuscoguttatus and male Epinephelus polyphekadion and two F-1 pure parentalÂ progenies. The fishes were reared by communal and separate tank systems. HybridsÂ were confirmed by allozymes electrophoresis. After three months of rearing, the F-1Â hybrids fish grew faster 45.9% and 66.6% compare to the F-1 pure parental progeniesÂ of E. fuscoguttatus and E. polyphekadion (P<005) respectively. Development stabilityÂ as measured by fluctuating asymmetry was lower in hybrid (20%-40%) than in the pureÂ parental progenies (53%-80%). Among four enzyme loci examined, only Pgm locusÂ showed variants and at that locus all hybrids fish were heterozygous. HeterozygousÂ hybrids showed lower fluctuating asymmetry and related to higher developmentalÂ stability. The higher developmental stability positively reflected a faster growth rate.Â Thus this finding can be used to explain the reason that why hybrids groupersÂ appeared grew faster than parental species.
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