Avances en Producción Animal N- 22 (1-2): 111-121, 1997. CARACTERISTICAS REPRODUCTIVAS, DE PESO Y LONGITUD CORPORAL Y SUS RELACIONES, EN SALMON COHO (Oncorhynchus kisutch) DE IFERENTES PISCICULTURAS
DE LAS X Y XI REGIONES (CHILE)1
REPRODUCTIVE TRAITS, BODYWEIGHT AND LENGTH AND ITS RELATIONS, IN COHO SALMON (Oncorhynchus kisutch) OF DIFFERENT HATCHERIES FROM THE X AND XI REGIONS (CHILE)
XIMENA GARCIA F.2, ROBERTO NEIRA R.2, NELSON F. DIAZ3 y FRANCISCO ESTAY C4.
Universidad de Chile
Facultad de Ciencias Agrarias y Forestales
Departamento de Producción Animal
Casilla 1004 - Santiago -Chile
Universidad de Chile
Facultad de Ciencias
Departamento de Ciencias Ecológicas
Casilla 653 - Santiago – Chile
The objetive of the research were to characterize the weight, lenght and reproductive performance got by Coho salmon females from different hatchens, reproductive seasons and date fo spawn and to
study the relationships among those variables. For this a total of 1,188 individual records of 2 years old females from your hatchenis located on X and XII Region. Controls were made during 1993
and 1994. The model used included effects of year or spawn season, hatchery, interaction and fecundation date. This one grouped in six class of 5 days each one. Both, the factor year of spawn and
hatchery include various effects as: different germoplasm, water temperature, feeding, general management. Association among variables was estimated by correlation coefficient of Pearson and
through the analysis of determination coefficients. Reproductive and weight characteristics showed high variability in some years and in sorne hatchechies indicanting an ambiental origen of this
variation year of spawn mainly affected survivance, number of life spawn at eye state and relative fecundity and did not affect the spawn diameter and body condition. Late spawn presented higher
mortality of eggs. Beside, female that spawed early or so late in the season produced eggs of less diameter. As the season of spawing went on, the needed time to reach eye state drecreased.
Females producing more eggs per kg of weight that is to say those of higher relative fecundity and most efficient tend to have more total fecundity, less weight and length producing more eggs at
eye state with less diameter and higher survivance females of higher weight had more length and tend to produce eggs of larger diameter. Keywords: Coho salmon, reproductive characteristic.
1.- Proyecto PI-10/ 1993 FONDEF y 1940259/1994 FONDECYT
2.- Ing. Agr. Depto. Prod. Animal. Fac. Cs. Agrarias y Forestales. Universidad de Chile. Casilla 1004, Santiago.
3.- Prof. Biol. y Ciencias. Depto. Cs. Ecológicas. Fac. Cs. Universidad de Chile. Casilla 653, Santiago.
4.- Médico Veterinario.