Avances en Producción Animal Nº 15(1-2): 115-121, 1990 RESULTADOS DE CRUZAMIENTOS ENTRE INDIVIDUOS SILVESTRES Y CULTIVADOS DE TRUCHA ARCOIRIS,
ONCORHYNCHUS MYKISS RESULTS FROM CROSSING WILD AND HATCHERY RAINBOW TROUTS, ONCORHYNCHUS MYKISS
ROBERTO NEIRA R.1, NELSON DIAZ P.2 , FRANCISCO ESTAY C3' Y XIMENA GARCIA 1.
Departamento de Producción Animal
Facultad de Ciencias Agrarias y Forestales
Departamento de Ciencias Ecológicas
Facultad de Ciencias
Universidad de Chile
lnformation on performance of population of wild and cultivated trouts and their reciprocal crosses are analized for reproductive performance of spawners and weight and lenght of' fingerlings at
140-171 days of age.
Wild spawner trouts used showed an average of 104.2 gr in weight, 22.6 cm in length with 352 ova produced of 3.9 mm in diameter. Cultivated female trouts weighed about 6 times more and were about
double the length, with a fecundity about 4 times greater. with ova of about 20% larder in diameter and of 1ower hatching rate measured at 7 days. Weight and lenght were highly correlated with
fecundity (85%) and independent of ova size. Results f'or a diallel cross analysis for weight and length of fingerlings al 140-171 days of age showed significant effects of pure lines and
maternal effects, no significant effects of hybrid vigor was found. The utilization of this type of crosses is discussed.
1 Ing. Agr. Depto. Prod. Animal. Fac. Cs. Agr. Y Forest. U. de Chile.
2 Prof. Biol. y Ciencias. Depto. C.s. Ecológicas. Fac. Cs. U. de Chile, Casilla 653. Santiago.
3 Méd. Vet.