The pale referred to in the idiom is usually taken to mean the English Pale, the part of Ireland under English rule, and therefore, as perceived by its rulers, within the bounds of civilization. pale see: beyond the pale
For the food, see Salmon as food. The chum salmon (Oncorhynchus keta) is a species of anadromous fish in the salmon family. It is a Pacific salmon, and may also be known as dog salmon or keta salmon, and is often marketed under the name silverbrite salmon.
Coho salmon fillets are flavorful and rich, great for entertaining. They do equally well grilled, baked, or pan-fried. When pan frying we suggest using traditional fats such as lard and coconut oil. Keta salmon fillets are thick and meaty, with a mild flavor. They are great for marinating and grilling, and for individuals who don't like an overpowering salmon flavor. From a fishery certified sustainable by the Marine Stewardship Council.