candlefish
noun
can·dle·fish ˈkan-dᵊl-ˌfish 
: a very oily anadromous marine food fish (Thaleichthys pacificus) of the smelt family that occurs along the North Pacific coast
called also eulachon
Example Sentences
Recent Examples on the Web These animals, identified as individuals by their markings and relationships, elicit concern and compassion, even love, as no mussel or candlefish or any other marine species smaller than a whale ever will. 
Nancy Lord, Anchorage Daily News, 16 Nov. 2019 Millie Clark, Acworth A: Also known as butterfish, blue cod, candlefish and coal cod, sablefish isn’t really part of the cod family at all. Atlanta Life, ajc, 15 Mar. 2018
Nancy Lord, Anchorage Daily News, 16 Nov. 2019 Millie Clark, Acworth A: Also known as butterfish, blue cod, candlefish and coal cod, sablefish isn’t really part of the cod family at all. Atlanta Life, ajc, 15 Mar. 2018 Word History
First Known Use
1866, in the meaning defined above