If the director elects to contract with cooperatives or private aquaculturists for the purpose of purchasing quality salmon smolts, contracting shall be done by a competitive bid process. In awarding contracts to private contractors, the director shall give preference to nonprofit corporations. The director shall establish the criteria for the contract, which shall include but not be limited to species, size of smolt, stock composition, quantity, quality, rearing location, release location, and other pertinent factors.