The Secretary of the Department of Natural Resources and Environmental Control may designate up to 2 days within National Fishing Week, which may or may not be consecutive, during each calendar year as “free sport fishing days.” On the designated “free sport fishing days,” residents and nonresidents are exempt from the fishing requirements of §§ 501, 505 and 506 of this title, but are subject to all other statutory and regulatory provisions that pertain to fishing.