Trout are a number of species of freshwater fish belonging to the Salmoninae subfamily of the Salmonidae family. Salmon belong to some of the same genera as trout but, unlike most trout, most salmon species spend almost all their lives in salt water. Trout are classifed as an oily fish. The word trout's also used as part of the name of some non-salmonid fish such as Cynoscion nebulosus, the spotted seatrout or speckled trout. Species The name trout's commonly used for some species in three of t… (More on Trout)