Definitions

from The Century Dictionary.

  • noun A local name of a variety of the common trout (Salmo fario stomachicus) of certain parts of Ireland (Galway, etc.), in which the coats of the stomach become thick, like the gizzards of birds, from feeding on shell-fish. Also called gizzard-trout.

Etymologies

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Examples

  • Another classification problem concerns the brown trout of Lough Melvin, Ireland, where three distinct populations—a large predatory trout known as “ferox,” a moderate-size invertebrate feeder known as “sonaghen,” and a smaller trout specializing on benthic food, snails, and crustaceans, known as “gillaroo”—coexist and maintain their identity.

    Trout and Salmon of North America Robert J. Behnke 2002

  • Another classification problem concerns the brown trout of Lough Melvin, Ireland, where three distinct populations—a large predatory trout known as “ferox,” a moderate-size invertebrate feeder known as “sonaghen,” and a smaller trout specializing on benthic food, snails, and crustaceans, known as “gillaroo”—coexist and maintain their identity.

    Trout and Salmon of North America Robert J. Behnke 2002

  • Another classification problem concerns the brown trout of Lough Melvin, Ireland, where three distinct populations—a large predatory trout known as “ferox,” a moderate-size invertebrate feeder known as “sonaghen,” and a smaller trout specializing on benthic food, snails, and crustaceans, known as “gillaroo”—coexist and maintain their identity.

    Trout and Salmon of North America Robert J. Behnke 2002

  • Another classification problem concerns the brown trout of Lough Melvin, Ireland, where three distinct populations—a large predatory trout known as “ferox,” a moderate-size invertebrate feeder known as “sonaghen,” and a smaller trout specializing on benthic food, snails, and crustaceans, known as “gillaroo”—coexist and maintain their identity.

    Trout and Salmon of North America Robert J. Behnke 2002

  • Now, however, science admits but one species, though, to such well-defined varieties as the Loch Leven trout, the estuarine trout and the gillaroo, it concedes the right to separate names and "races."

    Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 Various

  • Feeding on shell-fish thickens the stomach, and in many generations, probably, the gillaroo trout becomes so distinct a variety, as to render it doubtful if it be not a distinct species.

    The Mirror of Literature, Amusement, and Instruction Volume 12, No. 329, August 30, 1828 Various

  • On the hills behind the inn there is a small loch, called the MULACH-CORRIE, in which it is said that the gillaroo trout are to be found.

    Scotch Loch-Fishing William Senior

  • It would gladden the heart of Izaak Walton, as it is full of fish, among which is the famous gillaroo trout, which will not rise to the tantalising fly.

    The Sunny Side of Ireland How to see it by the Great Southern and Western Railway Robert Lloyd Praeger 1909

Comments

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  • A snail-eating Irish trout whose name derives from the deep red spots on its sides (Giolla Rua is the Irish for "red fellow"). It is apparently the only fish that has a gizzard (of sorts) to aid digestion. This anatomical curiosity lies behind the story that a priest, presented with a gillaroo on a Friday, refused to believe that it was not chicken and would not eat it; ever since, the fish has been considered cursed and unfit to eat.

    February 9, 2007