Maryland Code, Natural Resources § 4-730

(a) A person may not set, nor construct any kind or description of net in the Patuxent River from Queen Anne Bridge to the mouth of the river, within 1,500 feet in every direction from any other net, without the permission of the owner of the other net. In addition, a person may not set, nor construct, any net more than 425 feet in length, including the net's leaders, hedges, or wings, below a straight line from Holland's Cliffs across the river to a point on the shore directly opposite Holland's Cliffs, or more than 150 feet in length including the net's leaders, hedges, or wings, above the straight line from Holland's Cliffs. The provisions of this subsection do not apply to floating gill nets or seines.

(b) A person may not set or haul any seine or gill net in any creek, cove or tributary of the Patuxent River if the mouth of the creek or tributary is less than 200 feet wide.

(c) A person may not set or haul any drifting gill net in the Patuxent River south of the Patuxent River Bridge or in any creek, cove, or tributary of the river south of the Patuxent River Bridge at any time.