Gulf of Alaska | Fishes and Fish Habitats
Characterization of the sex-determining genomic region in the Pacific halibut ( Hippoglossus stenolepis ) and identification of a putative gene responsible for sex determination Presenter: Andrew Jasonowicz , andy.jasonowicz@iphc.int, International Pacific Halibut Commission J osep Planas , josep.planas@iphc.int, International Pacific Halibut Commission The Pacific halibut ( Hippoglossus stenolepis ) is a key species in the North Pacific Ocean and Bering Sea ecosystems, where it also supports important fisheries. Past research to identify genetic markers diagnostic of sex in Pacific halibut for their application in fisheries management identified several sex-linked loci that, in the absence of a Pacific halibut genome, led to the suggestion that genetic sex in Pacific halibut is likely under the control of loci present on a single chromosome. With the recent chromosome-level assembly of the Pacific halibut genome (https://www.ncbi.nlm.nih.gov/assembly/ GCF_022539355.2/), we have conducted genome- wide association analyses between female and male Pacific halibut to further characterize the sex-determining region in this species. These studies have resulted in the identification of a defined sex-linked region in females in Chromosome 9 that likely corresponds to the sex-determining region in Pacific halibut. Furthermore, within this region we have identified a potential candidate for the master sex-determining gene in Pacific halibut. These results suggest that, as observed in other teleost groups, the mechanisms responsible for sex determination among Pleuronectiform species have not been well conserved during evolution.
Alaska Marine Science Symposium 2023 195
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