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12.—(1)
(2) Subject to paragraph (3) below, such provisions of the 1968 Act as relate to fish shall cease to have effect in relation to salmon, trout, freshwater fish and eels, and accordingly, in section 2(1) of that Act, the following definition shall be substituted for the definition of “fish” there appearing—
“`fish'
(3) Any byelaws made by the Port of London Authority in force immediately before 1st April 1974 and relating to salmon, trout, freshwater fish and eels shall continue in force, and in any such byelaws, so far as they so relate, any reference to the Port of London Authority shall have effect as if it were a reference to the Thames Water Authority.