(a) Except as provided by Subsection (b), funds collected by the commission from the sale of marl, sand, gravel, shell, and mudshell may be used for:
(1) the enforcement of the provisions of this chapter;
(2) the payment of refunds;
(3) the construction and maintenance of fish hatcheries; and
(4) the enhancement, preservation, and restoration of fish habitats in rivers and streams.
(b) No less than three-fourths of the proceeds from the sale of marl, sand, gravel, shell, and mudshell, after the payment of refunds, shall be used for:
(1) the construction and maintenance of fish hatcheries; and
(2) the enhancement, preservation, and restoration of fish habitats in rivers and streams.