Estimates of heritability for alometric condition factor from 90 to 330 days in curimbatá

Marco Antonio da Rocha, Edson Luis de Azambuja Ribeiro, Ivone Yurika Mizubuti, Leandro das Dores Ferreira da Silva

Abstract


1 PROBLEMA

The relation between body weight and body length can be used to calculate the condition factor in fish. This factor express the grade of development of the fish. A sample of 253 fish from a hierarchial mating (5 females and 10 males) were used. Fishes were kept in net cages until, 150 days of age, and then marked and transferred to three tanks of I00m2/each; where they stayed until 330 days of age. The fishes were fed with a 30% crude protein and 2800 kcal/kg of metabolizable energy ration. Heritabilities of the alometric condition factor, from ages 90 to 300 days, were estimated using a model including female and mate within female. Heritabilities calculated from sire components of variance were: 0,28 ± 0,20; 0,11 ± 0,16; 0,24 ± 0,22: 0.20 ±0,19: 0,19 ± 0,19. respectively to 90, 150, 210. 270 and 330 days of age. These values suggest a small expected genetic gain from selection for this trait.

 



Keywords


Fish; Condition factor; Heritability



DOI: http://dx.doi.org/10.5433/1679-0359.2000v21n1p41

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional