Chum salmon
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| Chum salmon | |
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 A. Hoen and Co. · Public domain · source | |
| Name | Chum salmon |
| Genus | Oncorhynchus |
| Species | keta |
| Authority | (Walbaum, 1792) |
Chum salmon are an anadromous fish of the genus Oncorhynchus and species keta, native to the North Pacific Ocean and adjacent freshwater systems. They are a commercially important salmon species that undertake long migrations between Bering Sea, North Pacific Ocean feeding grounds and natal rivers such as the Yukon River, Kuskokwim River, and Columbia River for spawning. Chum salmon support fisheries and cultural practices across regions including Alaska, British Columbia, Hokkaido, and the Kamchatka Peninsula.
Taxonomy and nomenclature
Described by Johann Julius Walbaum in 1792, the species sits within the family Salmonidae and the genus Oncorhynchus, which also contains Pacific salmon such as Sockeye salmon, Coho salmon, Pink salmon, and Chinook salmon. Vernacular names vary by region and language, including Indigenous terms used by Tlingit, Haida, Ainu, and Yup'ik communities. Taxonomic work on population structure frequently references institutions such as the U.S. Fish and Wildlife Service, Fisheries and Oceans Canada, and academic centers like the University of Alaska Fairbanks and Hokkaido University.
Description and identification
Adult individuals are recognized by their streamlined body, distinct vertical bars during spawning, and pronounced kypes in males, with typical lengths ranging from about 50 to 70 cm and weights up to 9 kg. Field guides and keys produced by organizations such as the Alaska Department of Fish and Game, NOAA Fisheries, and the British Columbia Ministry of Environment compare this species with Pink salmon and Sockeye salmon using characters like gill raker counts and tooth morphology. Identification in mixed-stock fisheries often relies on methods developed at laboratories like the Pacific Biological Station and techniques popularized by researchers affiliated with the University of Washington.
Distribution and habitat
Populations inhabit coastal and riverine environments across the North Pacific rim, including the Sea of Okhotsk, Gulf of Alaska, Bering Sea, and the coasts of Korea and northern Japan. Spawning occurs in gravel-bedded streams and estuaries of major river systems such as the Norton Sound drainages, the Fraser River, and rivers on the Kamchatka Peninsula. Marine habitat use overlaps with areas exploited by fisheries run by entities like the North Pacific Anadromous Fish Commission and intersects with waters governed under agreements involving nations such as the United States, Canada, Japan, and Russia.
Life cycle and reproduction
Chum salmon are anadromous and semelparous, typically maturing over 2–5 years before returning to natal rivers to spawn once and die, a life-history described in work from institutions including NOAA Fisheries and the Alaska Department of Fish and Game. Spawning timing varies regionally, with fall runs documented in river systems like the Columbia River and spring runs in parts of Hokkaido. Stock-specific life-history traits have been examined using techniques at centers such as the North Pacific Anadromous Fish Commission and genetic laboratories at the British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development.
Ecology and diet
Juveniles utilize estuarine and nearshore habitats where they feed on zooplankton and small invertebrates; adult marine diets include euphausiids and small fishes, documented in studies from the Alaska Fisheries Science Center and the Pacific Biological Station. Predators include marine mammals like Steller sea lion and killer whale populations described by researchers at the National Marine Mammal Laboratory, and avian predators monitored by agencies such as the U.S. Fish and Wildlife Service. Interactions with other Pacific species, competition, and trophic roles are topics of ongoing research at institutions including the University of British Columbia and the Hakodate Fisheries Experimental Station.
Fisheries, management, and conservation
Chum salmon sustain commercial, recreational, and subsistence fisheries managed by bodies like NOAA Fisheries, Fisheries and Oceans Canada, and regional organizations such as the Alaska Department of Fish and Game. Management tools include escapement goals, catch quotas, and hatchery programs operated by state and provincial agencies and tribal authorities such as the Yukon River Drainage Fisheries Association and various First Nations governments. Conservation concerns involve habitat degradation, river damming exemplified by projects on the Columbia River, bycatch in high-seas fisheries regulated through the North Pacific Anadromous Fish Commission, and effects of climate variation studied by groups like the Pacific Salmon Commission.
Cultural and economic significance
Chum salmon are central to the subsistence, ceremonial, and trade economies of Indigenous peoples across Alaska Native, First Nations, and Ainu communities, with cultural practices documented by museums and research centers such as the Alaska Native Heritage Center and the Museum of Anthropology at the University of British Columbia. Commercial harvests contribute to regional economies in areas including Southeast Alaska, Hokkaido, and the Russian Far East and are important in markets tracked by agencies such as the Food and Agriculture Organization and national fisheries ministries. Culinary traditions feature preparations in households and restaurants from Vancouver to Sapporo and are represented in cultural festivals supported by municipal governments like the City of Anchorage and Hakodate City.