No person shall erect or continue any pound or weir upon any flat or other part of the bottom of the Pawcatuck River eastward or westward of its channel, between the first day of June and the twentieth day of March, or shall erect or continue any stationary net or like obstruction to the main channel of said river. No person shall fish with mesh or scoop nets in Pawcatuck River, or any of its branches, between sunset on Friday and sunrise on Monday from March twentieth to June first; and no person shall use more than one net therein.