If you are interested in Ferox trout there is a great video HERE from the Ferox 85 Group about Catch and Release. 

Although there is some debate about what a ferox actually is and whether it should be its own species this is a fairly widely accepted definition: 

Campbell (1979) 

‘Ferox are long-lived, late-maturing, piscivorous brown trout which in Britain and Ireland, are often present in large, deep glacier-formed lakes containing Arctic charr or whitefish species’

More info HERE