While I don't have any particular knowledge of Barbados specifically, I do know that the island is an accretionary wedge (geological formation). That basically means you'll find relative steep dropoffs close to shore, and you'll find very few, if any, flats. This will leave the potential for possible some reef fishing, or some activities in some of the protected bays if you can get into a kayak, but not exactly certain what more gamey species would call the areas around Barbados home. The silver lining is it has fantastic access to big game. You'd need to hire a charter boat, but you should get easy access to great mahi mahi, wahoo, tuna, and marlin fishing.