In aquaculture markers have been used mostly for parentage analysis to avoid family rearing or when physical tagging is not feasible. Rates of inbreeding need to be monitored in such schemes to maintain fitness. Markers can be of great use when developing base populations or when self-fertilization occurred, for optimizing mating decisions between candidates and obtained unbiased estimates of genetic parameters. In spite, of the great biological flexibility and the possibility of novel designs, QTL mapping and MAS are not well advanced in aquaculture. Consensus linkage maps are not yet widely available. The value of MAS using within family variation is expected to give only moderate improvements in response, for traits difficult to measure. The development of EST databases and bioinformatics in multinational projects will aid in the near future for selection of multiple-traits and multiple-genes jointly. Still all these techniques require being cost effective for MAS becoming profitable in actual breeding programmes.

V. Martinez

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 09.01, 2006
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