Teleost fish represent more than half of the total number of vertebrate species. Among the 30000 species of teleost fish, only a limited number of genomes are available, mostly in species that are phylogenetically relatively close. In addition, teleost fish have been subjected to several rounds of whole genome duplications since their radiation 300-350 million years ago. This further complicates molecular studies and gene annotation in a group of species of major economical and environmental interest. The project aims at studying gene evlution within teleosts and to provide evolutionary-based automatic gene annotation. In addition to the thorough analysis of new gene function after duplication, the projet will also yield significant amounts of new genomic ressources in several species of major economical and environmental interest.