In an area where a price dispute exists between at least one-third of the registered commercial fishermen for that area, as estimated by the Department of Fish and Game on the basis of information available to the department, and fish processors on the price to be paid for salmon, and no agreement has been reached up to 120 days before the opening of the salmon fishing season in that area, a representative from the Department of Labor and Workforce Development shall intervene as mediator of the dispute upon request of either party.