Issue |
Genet. Sel. Evol.
Volume 36, Number 6, November-December 2004
|
|
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Page(s) | 643 - 661 | |
DOI | https://doi.org/10.1051/gse:2004022 |
DOI: 10.1051/gse:2004022
Enhanced individual selection for selecting fast growing fish: the "PROSPER" method, with application on brown trout (Salmo trutta fario)
Bernard Chevassusa, Edwige Quilleta, Francine Kriega, Marie-Gwénola Hollebecqa, Muriel Mambrinia, André Fauréb, Laurent Labbéb, Jean-Pierre Hiseuxa and Marc Vandeputteaa Laboratoire de génétique des poissons, Institut national de la recherche agronomique, 78352 Jouy-en-Josas Cedex, France
b Station expérimentale mixte Ifremer-Inra, BP 17, 29450 Sizun, France
(Received 10 October 2003; accepted 30 June 2004)
Abstract -
Growth rate is the main breeding goal of fish breeders, but individual
selection has often shown poor responses in fish species. The PROSPER method
was developed to overcome possible factors that may contribute to this low
success, using ([see full textsee full text]) a variable base population and high number of breeders
(
Ne >100), ([see full textsee full text]) selection within groups with low non-genetic effects and (3)
repeated growth challenges. Using calculations, we show that individual
selection within groups, with appropriate management of maternal effects,
can be superior to mass selection as soon as the maternal effect ratio
exceeds 0.15, when heritability is 0.25. Practically, brown trout were
selected on length at the age of one year with the PROSPER method. The
genetic gain was evaluated against an unselected control line. After
four generations, the mean response per generation in length at one year was
6.2% of the control mean, while the mean correlated response in weight
was 21.5% of the control mean per generation. At the 4th generation,
selected fish also appeared to be leaner than control fish when compared at
the same size, and the response on weight was maximal (
130%
of the control mean) between 386 and 470 days post fertilisation. This high
response is promising, however, the key points of the method have to be
investigated in more detail.
Key words: Salmo trutta / selective breeding / aquaculture / genetics / individual selection
Correspondence and reprints: mvande@jouy.inra.fr
© INRA, EDP Sciences 2004