| Summary: | A genome scan, using microsatellite markers, was performed to detect quantitative trait loci for age at sexual maturation in two full-sib families of North American (NA) Atlantic salmon. Furthermore, linkage arrangements were compared between these NA fish and those found in the current European (EU) Atlantic salmon map. I found eleven QTL for age at maturity, as well as a rearrangement of the sex linkage region compared to EU fish. Four of the QTL were localized to two homeologous chromosomal segments. In addition, QTL were localized to linkage groups where similar effects were detected on the homologous linkage group regions in Arctic charr ('Salvelinus alpinus ') and rainbow trout ('Oncorhynchus mykiss'). The conservation of QTL effects across two other species of Salmonidae provide support for the identification of the QTL detected in Atlantic salmon, and suggest that certain regions of the salmonid genome retain ancestrally related syntenies with constrained functions.
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