There is a very large amount of knowledge about salmon in Ireland, but more limited hard scientific data on salmon population numbers. In evaluating sites for proposal as salmon special areas of conservation under the EU Habitats Directive, my Department, having consulted widely in the matter, has used the best information available under the following headings: sites of importance because of the size of the salmon population; sites important for spring salmon, which are genetically distinct and more threatened; good geographic range, that is, rivers from around Ireland; reasonable prospects regarding water quality and physical condition; and where appropriate, significant presence in sites of other habitats or species listed under the Habitats Directive.