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Master Thesis

Paramètres génétiques et recherche de prédicteurs des caractères de ponte et de développement embryonnaire chez la truite arc-en-ciel

Abstract : This internship was conducted as part of the BestOv project, lead by the SYSAAF. The internship objectives related to the BestOv project were : - Estimation of genetic parameters for reproductive and spawning traits. - Estimate genetic correlations between spawning traits and growth, morphology and level of fat reserve. Results presented cames from an artificial insemination. 600 families have been created from 10 semi-factorial crosses of 6 females with 10 males. Three biometrie were done, at 16 months, 20 months and 21 months after fertilization. Phenotypic measures were determined (weight, length, fat and ultrasound). Spawning performance data were measured at spawning (egg number, eggs total weight, egg size). The gonadosomatic yield, relative fecundity and K were calculated from these data. From photos taken 17 months after fertilization, individuals morphology was studied. Individuals from extream lots (n=150) for each spawning traits, were analysed by discriminante analyzes. No link was found between spawning traits and morphology for trouts 17 months after fertilization. Heritabilities of spawning traits were intermediate (0.35 – 0.51). Heritability of the spawning date (0.47) and correlation of the latter with the egg weight (0.53) and with the fat at spawning (-0.49) were estimated. E8/E23 proved to be a good predictor of relative fecundity (rg = -0.63). Gains and correlated responses between spawning traits were positive, except for the correlated response of the egg size with relative fecundity. Selection for pan size trou twill not deteriorate females reproductives and spawning traits. Selection for large trout may deteriorate gonado somatic index and relative fécundity.
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https://dumas.ccsd.cnrs.fr/dumas-01412929
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Submitted on : Friday, December 9, 2016 - 9:34:29 AM
Last modification on : Monday, July 6, 2020 - 3:38:22 PM
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Alexandre Lebeau. Paramètres génétiques et recherche de prédicteurs des caractères de ponte et de développement embryonnaire chez la truite arc-en-ciel. Agronomie. 2016. ⟨dumas-01412929⟩

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