Skip to Main Content
Influence of forest and rangeland management on anadromous fish habitat in Western North America: habitat requirements of anadromous salmonids.Author(s): D.W. Reiser; T.C. Bjornn
Source: Gen. Tech. Rep. PNW-GTR-096. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station: 1-54
Publication Series: General Technical Report (GTR)
Station: Pacific Northwest Research Station
PDF: View PDF (3.90 MB)
DescriptionHabitat requirements of anadromous and some resident salmonid fishes have been described for various life stages, including upstream migration of adults, spawning, incubation, and juvenile rearing.
Factors important in the migration of adults are water temperature, minimum water depth, maximum water velocity, turbidity, dissolved oxygen, and barriers.
Habitat requirements for successful spawning are suitable water temperature, water depth, water velocity, and substrate composition. Cover—riparian vegetation, undercut banks, and so on—is needed to protect salmonids waiting to spawn and may influence the selection of spawning locations.
Incubation requirements incorporate both extra- and intragravel factors. Extragravel factors are: dissolved oxygen, temperature, velocity, discharge, and biochemical oxygen demand of the stream. Intragravel factors are dissolved oxygen, temperature, permeability, apparent velocity, and sediment composition.
Important habitat components for juvenile rearing are fish food production areas, water quality, cover, and space. Good fish food production areas are mostly riffles with water depths of 0.15-0.91 m, water velocities of 0.30-0.46 m/s, and substrates of coarse gravel and rubble (3.2-30.4 cm). Good water quality for rearing salmonids includes mean summer water temperatures of 10.0°-14.0°C, dissolved oxygen at more than 80-percent saturation, suspended sediment less than 25 mg/liter, and fine sediment content of riffles less than 20 percent. Adequate cover—in the form of riparian vegetation, undercut banks, aquatic vegetation, and rubble-boulder areas—is needed to protect juvenile fish from predation and adverse physical factors.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationReiser, D.W.; Bjornn, T.C. 1979. Influence of forest and rangeland management on anadromous fish habitat in Western North America: habitat requirements of anadromous salmonids. Gen. Tech. Rep. PNW-GTR-096. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station: 1-54
Keywordsfish habitat, anadromous fish, salmonids, habitat needs
- Effects of spatial extent on modeled relations between habitat and anadromous salmonid spawning success
- A three-dimensional model for analyzing the effects of salmon redds on hyporheic exchange and egg pocket habitat
- Stream channels: The link between forests and fishes
XML: View XML