In response to a request by the Government of Guatemala and under the sponsorship of USAID, a pre-feasibility fishery survey was conducted from June 11 to 22, 1973, on the Lake Izabal, Rio Dulce, El Golfete system. The objectives were to provide the Ministry of Agriculture with recommendations for developing a realistic program of stock assessment and management for the fishery resources. The principal sources of information used in preparing this report were: (1) published reports dealing with marketing of freshwater fish products in Guatemala and fishery surveys in the Rio Dulce and the Gulf of Honduras, as well as unpublished reports dealing with recent limnological studies on Lake Izabal and the river system; (2) interviews with fishermen and buyers during 4 days on Lake Izabal and the Rio Dulce River System; (3) interviews with government officials engaged in fishery related services.