Eulachon

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Eulachon

Scientific classification

Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Osmeriformes
Family:	Osmeridae
Genus:	Thaleichthys
Species:	T. pacificus

Binomial name

Thaleichthys pacificus
Richardson, 1836

The eulachon, also hooligan or candlefish, is a small anadromous ocean fish, Thaleichthys pacificus, a smelt found along the Pacific coast of North America from northern California to Alaska. It feeds primarily on plankton as well as fish eggs, insect larvae, and small crustaceans. It forms an important part of the diet of many ocean and shore predators, and serves as a prominent food source for people living near its spawning streams.

The common names of this fish have a somewhat confusing relationship. The name "candlefish" derives from the fact that it is so fat during spawning, with up to 15% of total body weight in fat, that if caught, dried, and strung on a wick, it can be burned as a candle. This is the name most often used by early explorers. The name "eulachon" (occ. "oolichan", "oulachon", "uthlecan", etc.) is from the Chinookan language and the Chinook jargon based on that language. The name "hooligan" appears to have been derived from "eulachon" by similarity with the English slang term for a ruffian or scoundrel which gained currency in the late 19th century.

Eulachon, as anadromous fish, spend most of their adult lives in the ocean but return to their natal freshwater streams and rivers to spawn and die. As such, one stream may see regular large runs of eulachon while a neighboring stream sees few or none at all. Regular annual runs are common but not entirely predictable, and occasionally a river which has large runs sees a year with no returns; the reasons for such variability are not known. The eulachon run is characteristic for the early portion being almost entirely male, with females following about midway through the run to its conclusion. Males are easily distinguished from females during spawning by fleshy ridges which form along the length of their bodies.

Indigenous and Inuit made eulachon an important part of their diet, as well as a valuable trade item with people who lived outside of its range. They were caught using traps, rakes, and nets. The harvest continues today, with other residents taking part in the exploitation of the large runs. Today harvested eulachon are typically stored frozen and thawed as needed. They may also be dried, smoked, or canned. Most Native American and Eskimo groups also boiled large amounts of eulachon for the rich oil, which is easily skimmed and preserved. Preserved eulachon oil formed a valuable trade commodity for coastal people, and the numerous passes through the coastal mountains used for this trade were called "grease trails". Other uses include bait for sport and subsistence fishing, and food for cats and dogs.

The unrelated sablefish Anoplopoma fimbria is also called "candlefish" in the United Kingdom.