Eulachon, also known as candlefish or hooligan, are small, oily fish found in the Pacific Northwest. These fish migrate each year from the ocean to freshwater rivers to spawn. The term "candlefish" comes from the fact that these fish are so oily that they were used by Native Americans as a source of light; the oil in their bodies allows them to burn like a candle. The term "hooligan" likely comes from a Russian word for these fish, which is pronounced similarly. Other synonyms for eulachon include ooligan, hoolihan, and smelt. These fish are an important part of the ecosystem and are a traditional food source for many Indigenous communities in the Pacific Northwest.