Presence also increased closer to rivers with Chinook salmon, Oncorhynchus tshawytscha, runs (such as the Susitna River), and the Susitna Delta also supports two major spawning migrations of eulachon, Thaleichthys
pacificus, a small, schooling smelt, in May and July.
Oolichan (smelt, Thaleichthys
pacificus) oil is one of the most important foods of the Salish people.
Scientific name, Thaleichthys
pacificus, is from the Greek thaleia, meaning rich, ichthys, meaning fish, and pacificus, meaning of the Pacific.
Finally, anadromous species, such as Pacific salmon and eulachon, Thaleichthys
pacificus, represent a concentrated feeding opportunity that the beluga population may depend on as an important component of their annual nutrition.
This includes species observed in the spring diet, such as eulachon, Thaleichthys
pacificus, and sculpin, Cottidae; cod, Gadidae; and flatfish, Pleuronectidae (Quakenbush et al.
in the online Barcode of Life Database (BOLD; Ratnasingham and Hebert 2007).
Since fish availability was a consideration, site scheduling took into account neap tides for flatfish (yellowfin sole, Limanda aspera, and starry flounder, Platichthys stellatus) as well as the timing of anadromous fish runs such as eulachon (or "hooligan"), Thaleichthys
pacificus, and Pacific salmon, Oncorhynchus spp.
(Ayres 1860)--Longfin Smelt
Other prey species from the stomach obtained in Yakutat are surf smelt, Hypomesus pretiosus; eulachon, Thaleichthys
pacificus; and Pacific herring, Clupea pallasii (ADFG (6)).
17% per day, suggesting that the progression from a 31 May to a 11 June survey start date corresponds with a change in beluga diving behavior, possibly related to prey switching from small smelt (eulachon, Thaleichthys
pacificus) to adult salmonids (Chinook salmon, Oncorhynchus tshawytscha).
pacificus, and Chinook salmon were the only prey identified to species during this time period.
Shrinkage correction and length conversion equations for Theragra chalcogramma, Mallotus villosus and Thaleichthys