Genomic organization and evolution of olfactory receptors and trace amine-associated receptors in channel catfish, Ictalurus punctatus.

•The OR and TAAR repertoires in channel catfish were identified and characterized by mining existing genomic resources.•Two conserved orthologous blocks containing OR genes between the genomes of catfish and zebrafish were identified.•The arrangements of conserved motifs within fish ORs and TAARs were generally identical.•The complete loss of a conserved motif in fish OR family H may contribute to its divergence from other families.•The most selection pressures were imposed on fish TAAR subfamily 14 among all genes involved in olfaction.