title: [Composition, growth and conditionindex for a population of Poecilia reticulata (Pisces: Poeciliidae), in a pond in Heredia, Costa Rica].
abstract: A pond population of Poecilia reticulata was studied in Santo Domingo, Heredia, Costa Rica, between September and November of 1998. The sex ratio was 1:0.49 (males:females). The mean total length was 34.43 +/- 7.26 mm for females, 23.50 +/- 2.24 mm for males and 12.27 +/- 3.41 mm for juveniles. The mean total weight was 0.69 +/- 0.48 g for females: and 0.16 +/- 0.05 g for males and 0.026 +/- 0.027 g for juveniles. The total length-weight relationship for the total population was P= 6 x 10(-5) Lt 3.3272 (r2 = 0.9613). The condition index equation was K = 25.755 e(0.004Lt) (r2 = 0.8925) for females and K = 26.767 e(0.003Lt) (r2 = 0.907) for males. The mean condition index was 31.29 +/- 0.55% for females and 28.52 +/- 0.19% for males. Both sexes reached the sexual maturity when the males and females overcame the 20.00 mm and 23.5 mm of Lt respectively.
authors.affiliation: Laboratorio de Recursos Naturales y Vida Silvestre, Escuela de Ciencias Biológicas, Universidad Nacional, Heredia 86-3000, Costa Rica
authors.forename: Mario
authors.initials: M
authors.lastname: Urriola Hernández
authors.forename: Jorge
authors.initials: J
authors.lastname: Cabrera Peña
authors.forename: Maurizio
authors.initials: M
authors.lastname: Protti Quesada
mesh_terms: D000818:Animals; D001699:Biometry; D049628:Body Size; D003364:Costa Rica; D005260:Female; D008297:Male; D011036:Poecilia / Q000033:anatomy & histology* / Q000254:growth & development / Q000502:physiology; D012744:Sex Ratio; D012741:Sexual Maturation