Tonguefishes are a family, Cynoglossidae, of flatfishes.

They are found in tropical and subtropical oceans, mainly in shallow waters and estuaries, though a few species found in deep sea floors, and a few in rivers.

Some species have been observed congregating around ponds of sulphur that pool up from beneath the seafloor. Scientists are unsure of the mechanism that allows the fish to survive and even thrive in such a hostile environment,


There are 138 species in 3 genera:


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