Species: Oncorhynchus mykiss pop. 13
Steelhead - Snake River Basin
Species
Encyclopedia of Puget Sound
Classification
Kingdom
Animalia
Phylum
Craniata
Class
Actinopterygii
Order
Salmoniformes
Family
Salmonidae
Genus
Oncorhynchus
NatureServe
Classification
Informal Taxonomy
Animals, Vertebrates - Fishes - Bony Fishes - Salmon and Trouts
Formal Taxonomy
Animalia - Craniata - Actinopterygii - Salmoniformes - Salmonidae - Oncorhynchus - are now relatively rare (Behnke 2002). This ESU includes Snake River Run A (pop 21) and Snake River Run B (pop 22).
Ecology and Life History
Habitat Type Description
Freshwater
Migration
false - true - true - Migrates between freshwater breeding and marine nonbreeding habitats (as defined by NMFS 1996, this entity does not include nonanadromous forms). This ESU comprises summer steelhead; river entry occurs from June to October (NMFS 1996).
Non-migrant
false
Locally Migrant
true
Reproduction Comments
Spawns March-May. First-time spawners generally are 4-5 years old. Individuals are capable of spawning more than once before they die, though spawning more than twice is rare. Steelhead eggs incubate 1.5-4 months before hatching (varies with temperature). Juveniles spend 1-4 years in fresh water before migrating to the ocean as smolts. Smoltification occurs usually at age-2 or -3 years (NMFS 1996).
Conservation Status
NatureServe Global Status Rank
G5T2T3Q
Global Status Last Reviewed
1997-11-06
Global Status Last Changed
1996-09-11
Other Status
LT - LT: Listed threatened - 2006-01-05
Distribution
Conservation Status Map
<img src="http://www.natureserve.org/explorer/servlet/GetMapGif?US.ID=S2&US.OR=S2&US.WA=SNR" alt="Conservation Status Map" style="width: 475px; height: auto;" />
Global Range
F - 20,000-200,000 square km (about 8000-80,000 square miles) - F - Range includes the Snake River basin of southeastern Washington, northeastern Oregon, and Idaho (NMFS 1996). With the exception of the Tucannon River and some small tributaries to the mainstem Snake River, the tributary habitat used by Snake River Basin steelhead ESU is above Lower Granite Dam (Good et al. 2005). Major groupings of populations and subpopulations can be found in 1) the Grande Ronde River system; 2) the Imnaha River drainage; 3) the Clearwater River drainages; 4) the South Fork Salmon River; 5) the smaller mainstem tributaries before the confluence of the mainstem Snake River; 6) the Middle Fork Salmon River, 7) the Lemhi and Pahsimeroi rivers, and 8) upper Salmon River tributaries (Godd et al. 2005).<br><br>Spawning range extent is more than 20,000 square kilometers and appears to be less than 100,000 square kilometers.
Global Range Code
F
Global Range Description
20,000-200,000 square km (about 8000-80,000 square miles)