Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51005#.VFHVKlfHRK0 Author(s) Trygve Gjedrem , Nick Robinson Affiliation(s) Nofima, Osloveien 1, 1430 Ås, Norway . ABSTRACT During the last 40 years it has been shown that well planned family-based breeding programs yield high rates of genetic improvement for aquatic species. The genetic gain has been greater than 12% per generation for growth rate and for disease resistance when challenge tests are applied. The main reasons for the large genetic gains observed for aquatic species are their relatively high fertility and the natural existence of broad genetic variation for economically important traits, both of which allows ...
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