In Caribbean fly-fishing, a Grand Slam is when an angler is able to catch a bonefish, tarpon and permit during one day of fishing. The International Game Fish Association (IGFA) defines an Inshore Grand Slam as catching any three of the following species on the same day: bonefish, tarpon, permit, and snook.
The seas surrounding Cuba are one of the most spectacular places to accomplish a Grand Slam. Also exists a Gran Grand Slam, that consists in catching the four species previously mentioned.
References
Grand Slam (Fly-Fishing Caribbean) Wikipedia(Text) CC BY-SA