(1) It is unlawful in the waters of the Willamette River or any of its tributaries or sloughs to take salmon, shad, striped bass or sturgeon for commercial purposes.
(2) Notwithstanding subsection (1) of this section, it shall be lawful to take shad for commercial purposes in the Willamette Slough from the Gilbert Lake farm dock to the mouth of the Willamette Slough.