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Brackish Fish
Fish - Fresh Water
A brackish water aquarium is an aquarium where the water is brackish (semi-salty). The range of "saltiness" varies greatly, from near freshwater to near marine and is often referred to as specific gravity (SG) or salinity. Brackish water aquaria is a popular specialization within the fishkeeping hobby.
http://en.wikipedia.org/wiki/Brackish-water_aquarium