Fertility,fecundity and gonadosomatic index of Poecilia reticulata (Pisces:Poeciliidae)in Heredia,Costa Rica.Between September and November of 1998,1 432 females of Poecilia reticulata were collected in a pond in Santo Domingo,Heredia,Costa Rica.The average total length of females was 34.43 ± 7.26 mm (range 17.80 and 51.50 mm)and the average total weight of 0.69 ± 0.48 g (range 0.06 and 2.32 g). This species is a viviparous matrotrofic and the specimens were sexually mature.The total length-fertility relationship was F =0.527e ^0.1171Lt (r² =0.9404).The average fertility was 56.1 ± 43.6 (eggs +embryos)(range 8.0 and 197.6).The total length-fecundity relationship was Fo =0.695e^{0.1076 Lt} (r² =0.9376).The average fecundity was of 49.0 ± 36.0 (oocytes +ova)(range 7.0 and 179.0).The total length-gonadosomatic index relationship was IGS =0.0014 e^{0.134 Lt} (r² =0.8581).The average gonadosomatic index was 0.25 ± 0.27%(range 0.02 and 1.31%).Rev.Biol.Trop.52(4):945-950.Epub 2005 Jun 24.

Poecilia reticulata ; Poeciilidae; fertilidad; fecundidad; índice gonadosomático; Costa Rica