Ferox trout (Salmo ferox) is a variety of trout found in oligotrophic lakes of Ireland, England, Scotland and Wales. Ferox trout is a traditional name for large, piscivorous trout, which in Scotland feed largely on Arctic char. It has been argued to be a distinct species, being reproductively isolated from "normal" brown trout (Salmo trutta) of the same lakes, particularly in Ireland. However it is uncertain whether the ferox of different lakes all are of a single origin. This fish grows to a length of 80 centimetres (31 in) SL.
Scottish authorities currently do not regard Scottish ferox to be taxonomically distinct from Salmo trutta.
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