4.—(1) The Association may, with the consent of the Scottish Ministers, from time to time impose restrictions on, and make regulations respecting, the dredging, fishing for and taking of cockles within the whole or any specified part of the fishery.
(2) Without prejudice to the generality of paragraph (1), regulations may be made under that paragraph for the purpose of–
(a)determining the size below which or above which it shall be unlawful to take cockles from the fishery or to remove them from one part of the fishery to another; and
(b)determining the number, size or description of vessels, vehicles, dredges and fishing instruments to be used in dredging, fishing for or taking cockles.
(3) The production of a copy of any restriction or regulation purporting to be certified by the Scottish Ministers shall be conclusive evidence of the existence of the restriction or regulation and of the due making of it.