Abstract
Twenty three polymorphic microsatellite markers were developed from approximately 2,300 expressed sequence tags (ESTs) of Atlantic cod (Gadus morhua L.). Seventy two primer pairs were designed for EST sequences containing perfect di-nucleotide motifs and characterised in 96 unrelated fish. Twenty three markers were successfully amplified with number of alleles from 2 to 18 per locus and observed and expected heterozygosity ranging from 0.03 to 1.00 and 0.04 to 0.90, respectively. Loci Gmo-C280, Gmo-C283, Gmo-C290 and Gmo-C293 deviated from Hardy–Weinberg equilibrium. Genetic linkage disequilibrium analysis between all pairs of the loci showed significant departure from the null hypothesis between loci Gmo-C267 and Gmo-C269 and Gmo-C262 and Gmo-C291. The gene identity was determined at three of the loci, confirming the associated microsatellites as Type I markers. These microsatellite markers provide useful tools for studies of population genetics, reproductive ecology and constructing linkage maps of Atlantic cod.
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