Today, the Potomac River Fisheries Commission (PRFC) regulates the fisheries of the main stem of the tidal Potomac River from the Maryland/Washington D.C. boundary line (near the Woodrow Wilson Bridge), to the mouth of the river at Point Lookout, MD and Smith Point, VA. The PRFC regulates all recreational and commercial fishing, crabbing, oystering and clamming in the main stem tidal Potomac River, and issues licenses for those activities.
The Potomac River Fisheries Commission is a Maryland and Virginia bi-state Commission, which regulates all fishing on the tidal mainstem of the Potomac between Washington, DC and the Chesapeake Bay, exclusive of the tributaries on either side of the river.
Each of these four jurisdictions has the authority to, and does, publish and enforce rules, regulations and laws dealing with such fishing matters as seasons, size limits, creel limits and licensing requirements. Knowing where you are fishing is important because licensing requirements, season and limits can be, and sometimes are, quite different. It is your responsibility to know what the laws are where you are fishing, crabbing or oystering.http://www.prfc.state.va.us/sports/sport_fishing_blue_sheet_.htm#reciprocity
Crab Rules -> http://www.prfc.state.va.us/sports/Sport%20Crabbing%20Limits%20.pdf