H.R.3840: To prohibit commercial fishing of Atlantic menhaden for reduction purposes in inland, State, and Federal waters along the Atlantic coast of the United States, and for other purposes.

Atlantic Menhaden Conservation Act - Imposes a fishing moratorium regarding Atlantic menhaden that are reduced to meal and oil for the coastal waters of each coastal state north of South Carolina, including Pennsylvania, the District of Columbia, and the Potomac River Fisheries Commission.

Requires studies and reports.

Makes it unlawful to engage, or to attempt to engage, in the commercial harvesting, in the Exclusive Economic Zone (EEZ), of Atlantic menhaden that are reduced to meal and oil.