19. In section 69 of the principal Act, for subsection (2) there shall be substituted the following subsection—
“(2) Any person (other than the owner of a several fishery in the whole of a river or its tributaries, within the limits of that several fishery)—
(a)who shoots, draws or stretches a net across the mouth or across any other part of a river; and
(b)who fails to leave open a channel which is—
(i)at least one-quarter of the width of the mouth of the river or, as the case may be, of that other part of the river, or 18 metres, whichever is the less, and
(ii)of sufficient depth and width to facilitate the passage of salmon in that river;
shall be guilty of an offence.”.