It inhabits primarily lowland freshwater and brackish wetlands. They frequently migrate through brackish water estuaries to freshwater springs. They also enter estuaries and inhabit brackish waters. Oysters naturally grow in estuarine bodies of brackish water. The water in wetlands is either freshwater, brackish, or saltwater. Cercarial dermatitis is common in freshwater, brackish and marine habitats worldwide. The common fish louse lives in marine, brackish, and freshwater environments. Skates are absent from brackish and freshwater environments. In the hollows of the plains are ponds or lakes of fresh and brackish water. The species is very common, and widespread in marine, brackish and freshwater environments. The siliceous frustules of diatoms accumulate in fresh and brackish wetlands and lakes. Brown algae growing in brackish waters are almost solely asexual. The river cooter lives in a wide variety of freshwater and even brackish locations. Larvae hatch from the eggs in brackish waters. It is euryhaline, occurring in both brackish and freshwater.