genetic map, one must establish correspondences between DNA marker and line at
random, which is not a very efficient approach. As was mentioned in the case of
DNA markers, it is crucial to establish a framework map showing positional
relationships among markers (Okamoto 2000).
5.7.3 Current State of Research Toward Selective Marine
Breeding with Markers
This section introduces research toward the use of DNA markers in marine
breeding, as well as fish species for which microsatellite markers (Fig. 5.16) are
being isolated. While these markers are still for the most part used for research
analysis (resources prediction), they may also be applicable to marine breeding in
the future (Xu and Crouch 2008).
First, research toward marine breeding will be examined. Researchers in five
European countries (Norway, Ireland, the United Kingdom, Denmark, and France)
and Canada have launched the SALMAP project with the goal of improving
quantitative traits (QT) in fish from the salmon family, including meat quality,
Fig. 5.16 Principles of the microsatellite marker detection method
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5 Genetic Diversity and DNA Markers in Fish