You are here
Species
Salmo gairdnerii (Richardson, 1836)
IUCN
NCBI
EOL Text
Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.
Locally Migrant: Yes. At least some populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: Yes. At least some populations of this species make annual migrations of over 200 km.
In the Kootenai River drainage, Montana, 23 redband trout monitored from October to December had home ranges of 5-377 m (mean 67 m) (Muhlfeld et al. 2001).
Comments: Eats aquatic insects, crustaceans, and zooplankton; also other fishes and fish eggs; may defend feeding area. Adult migrants seldom feed in freshwater.
See Stearley (1992) for a discussion of the historical ecology and life history evolution of Pacific salmons and trouts (ONCORHYNCHUS).
Rounded Global Status Rank: T4 - Apparently Secure
Global Short Term Trend: Decline of 10-30%
Comments: In the Columbia River basin, nearly all upriver and many lower river stocks have declined, though most Snake River native stocks appear to be improving after having declined (Nehlsen et al. 1991).
Comments: Snake River native stocks are threatened by mainstem passage problems (e.g., dams), inadequate water flows, and habitat degradation (Nehlsen et al. 1991). Many stocks in the Columbia River basin are threatened by mainstem passage problems, habitat damage (due to logging, road construction, mining, agriculture, and grazing, which decrease water quality and increase siltation), and interactions with hatchery fishes (Nehlsen et al. 1991). Dams cause problems for migrants via mortality in turbines, increased predation in impoundments and below dams, and loss of migratory motivation in the impoundments (Spahr et al. 1991).
Management Requirements: Patterns of genetic structure in populations in the upper Columbia River drainage indicate that watershed-specific broodstocks are needed by fisheries managers for reintroduction or supplementation of populations at risk of extinction (Knudsen et al. 2002).
Needs: See Nehlsen et al. (1991) for general protection and management recommendations for anadromous salmonids.
The Columbia River redband trout,[1] the inland redband trout[2] or the interior redband trout[1] (Oncorhynchus mykiss gairdneri) is one of three redband trout subspecies of the rainbow trout in the Salmonidae family.[3] It is native in the Columbia River and its tributaries in Montana, Oregon, Washington and Idaho. It includes sea-run anadromous forms, which are known as redband steelhead. Also the large Kamloops rainbow trout is included.[2]
Notes[edit]
- ^ a b Columbia River Redband Trout - Oncorhynchus mykiss gairdneri fieldguide.mt.gov
- ^ a b Inland Redband Trout - Oncorhynchus mykiss gairdneri fishandgame.idaho.gov
- ^ Behnke, Robert J.; Tomelleri, Joseph R. (illustrator) (2002). "Rainbow and Redband Trout". Trout and Salmon of North America. The Free Press. pp. 65–122. ISBN 0743222202. Cite uses deprecated parameters (help)
|
This Salmonidae article is a stub. You can help Wikipedia by expanding it. |