 Originally intended for aquaculture, tilapia species including, "Oreochromis mossambicus", and "Tilapia zilli" have become widely established in ponds and streams across the island.Brackish water species also occur, particularly in coastal wetlands such as the Graeme Hall Swamp; one such species is the mangrove rivulus ("Rivulus marmoratus"), notable for its unique ability of self fertilization.A resident and isolated population of Atlantic tarpon, ("Megalops atlanticus") has become established in the Graeme Hall Swamp.