Grease trail

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Eulachon

A grease trail is an overland trade route, part of a network of trails connecting the Pacific coast with the Interior in the Pacific Northwest. Trails were developed for trade between indigenous people, particularly the trade in eulachon oil. The grease from these small fish could be traded for furs, copper, obsidian, among other things. The Stóːlō people of the Fraser River simply ate the fish, either fresh or smoked, but the people of the interior used the oil as a condiment (similar to butter) and in various other ways.