Mobile Bay

The diamond killifish, Fundulus xenicus, is a killifish native to the coastal waters of the northern Gulf of Mexico, from southern Florida to Texas. It lives in shallow lagoons, salt marshes and pools, usually in brackish water, and fares poorly with prolonged exposure to fresh water, so marine salt at 3-10 g/L is considered essential in the aquarium. Uncommon in the hobby, it is best kept on its own in a group of two or three females to each male.