sonaghen

“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.”

Simon & Schuster: Trout and Salmon of North America