Results of a study published Tuesday show that coastal habitat enhancement programs managed by the state fisheries agency provide $4 in benefits for every $1 invested in the coastal region.The Albemarle-Pamlico National Estuary Partnership contracted with RTI International to study the benefits and costs of three programs under the state Division of Marine Fisheries: the Shellfish Rehabilitation Program, Oyster Sanctuary Program and Artificial Reef Program. The study focused on how these programs benefit and contribute to communities in the region.