Gillaroo (Salmo stomachicus; historically included in Salmo trutta) is a variety of trout which eats primarily snails and is only proven to inhabit Lough Melvin in Ireland.The name gillaroo is derived from the Irish for "red fellow" (giolla rua); this is due to the fish's distinctive colouring. It has a bright, buttery golden colour in its flanks with bright crimson and vermilion spots.