Belize, with its extensive Caribbean coastline and hundreds of cayes (islands), offers excellent opportunities for sea fishing. The waters around Belize are teeming with game fish, including marlin, sailfish, dorado (mahi-mahi), wahoo, and tuna offshore; barracuda, kingfish, snapper, grouper and jacks nearshore and bonefish, tarpon, and permit on the flats. Belize is particularly famous for its Grand Slam fishing, which is catching a bonefish, tarpon, and permit all in one day.
For further information on travelling to Belize
https://anglersworld.tv/game-fishing/belizeinformation/