A standardized microsatellite marker panel for parentage and kinship analyses in channel catfish,Ictalurus punctatus

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This research was designed to produce a standardized set of microsatellite loci for parentage and kinship analyses in channel catfish, the leading species of US aquaculture. Three panels of five to six markers each were developed that contained a total of two dinucleotide-, eight trinucleotide- and seven tetranucleotide-microsatellite loci respectively. The loci had a range of nine to 31 alleles per locus in an outbred population. Based on the allele frequencies measured in commercial randomly bred broodstock, the combined probability of non-exclusion of an unrelated candidate parent pair was 5.36e-18. The combined probability of non-exclusion of unrelated identical genotypes was 2.58e-08. The microsatellite panels were validated by parentage and kinship evaluation in three populations. A total of 697 spawns were collected from matings of outbred broodstock over three spawning seasons, and parents were determined unambiguously for all but three spawns. Genotype analysis also enabled the identification of half-sibling and full-sibling families produced by pond spawning. In a second experiment, parentage was unambiguously determined in nine spawns from a population consisting of broodstock derived from only four families. A third experiment demonstrated that all but one of 374 individuals from 10 full-sibling families could be assigned to a family after coculture in an earthen pond for 1 year. The standardized microsatellite panels enable the development of pedigreed catfish populations and large-scale performance evaluations in common environments to support the genetic improvement of cultured catfish through selective breeding.

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