Nothing contained in this chapter shall affect the authority of the department of fish and wildlife to construct facilities or make improvements to facilitate the passage or propagation of fish nor shall anything in this chapter be construed to interfere with the powers, duties, and authority of the department of fish and wildlife to regulate, manage, conserve, and provide for the harvest of fish or wildlife within any area designated as being in the state's scenic river system. No hunting shall be permitted in any state park.