The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Oncorhynchus keta
Oncorhynchus keta
(Chum Salmon)
Native Transplant

Copyright Info
Oncorhynchus keta (Walbaum in Artedi, 1792)

Common name: Chum Salmon

Taxonomy: available through www.itis.govITIS logo

Identification: Moyle (1976a); Scott and Crossman (1973); Wydoski and Whitney (1979); Morrow (1980); Eschmeyer et al. (1983); Page and Burr (1991).

Size: 102 cm.

Native Range: Arctic and Pacific drainages from Anderson and Mackenzie rivers, Northwest Territories, through much of Alaska south to Sacramento River drainage, California; rarely to San Lorenzo River, southern California. Also in northeastern Asia (Page and Burr 1991).

Native range data for this species provided in part by NatureServe NS logo
Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Oncorhynchus keta are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
ID193919391Bear Lake
ME193819384Lower Kennebec River; Maine Coastal; Presumpscot; St. George-Sheepscot
MI194519451St. Clair-Detroit
NV193920014Central Lahontan; Middle Carson; Truckee; Walker Lake
UT193919392Fremont; Strawberry

Table last updated 6/13/2024

† Populations may not be currently present.

Means of Introduction: Authorized stockings took place in the 1930s and 1940s. The stocking in Idaho took place in 1939 (Linder 1963). The stocking in Maine took place in 1938 (Everhart 1950). The Michigan stocking occurred in 1945 (Emery 1985).

Status: Stocking attempts failed to generate reproducing populations.

Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.

Remarks: There is some question concerning the identity of the salmon stocked into Michigan. Emery (1985) reported that they may have been misidentified chinook or coho salmon. Parsons (1973) made no mention of this species being stocked in the Great Lakes.

FishBase Summary

Author: Fuller, P.

Revision Date: 4/20/2006

Peer Review Date: 4/20/2006

Citation Information:
Fuller, P., 2024, Oncorhynchus keta (Walbaum in Artedi, 1792): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=907, Revision Date: 4/20/2006, Peer Review Date: 4/20/2006, Access Date: 6/13/2024

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [6/13/2024].

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