R.I. Gen. Laws § 20-12-6: Obstructions to fish culture.

The director of environmental management may seize, and remove summarily if need be, all obstructions erected to hinder the passage of fish or that are illegally erected to obstruct, or in any way impede, the growth and culture of fish; and every person rebuilding or continuing any obstruction after it has been removed and notification has been given by the director, shall be fined not less than five hundred dollars ($500) for each offense.