Definition: Prioritizes areas based on fish species that are most susceptible to major affects from development, including those species that rely on extensive migratory routes and species endemic and rate within Oregon.
Aggregation Method: Fish species were prioritized by potential impacts to a species from potential development, with a focus on migratory routes and rare, endemic species. Fish species and habitats were split into the priority ranks listed below, and then best available data was used to assess if distribution of species or habitat fell into a given area.
Priority Rank Definitions
Priority 1: Documentation of at least one of the following species or habitats, using best available distribution data:
- Salmonid species whose principal migration form is anadromy, irrespective of species status. Species List: Chinook Salmon, Coho Salmon, Chum Salmon, Steelhead, Sockeye Salmon.
- Salmonid species or sub-species that inhabit endorheic basins, with no access for anadromy and whose principal migration form is potamodromy, and can includes adfluvial variant. Species List: Redband Trout (Specific Populations), Lahontan Cutthroat Trout.
- Salmonid species or sub-species that inhabit an exhoreic basin, but are functionally resident within the basin (due to both natural and anthropogenic barriers that limit expression of anadromy.) Principal migration form is potamodromy, and can include adfluvial variant. Species List: Bull Trout, West Slope Cutthroat Trout (Specific Populations).
- Non-salmonid species or sub-species that is endemic to Oregon and is rare, defined as: 1) apparent adaptation to a unique environment (extremely limited spatial extent) and 2) no potential for potamodromy or interbasin gametic exchange. Species List: Borax Lake Chub, Hutton Springs Tui Chub, Foskett Speckled Dace.
- Estuarine habitat
- Cold water spring sources
Priority 2: Does not contain any species or habitat listed within Aquatic Species of Concern priority rank 1, and does include at least one of the following species of habitats, using best available distribution data:
- Salmonid species or sub-species that inhabit an exhoreic basin, and is: 1) above a natural anadromous fish barrier, but 2) due to proximity to polygons with anadromous life history forms, can still support anadromy downstream (life history variant of more dominant anadromous form: some potential downstream migration access into anadromous salmonid polygons but with no reciprocal migration access above anadromous polygons). Species List: Coastal Cutthroat Trout, Redband Trout (Specific populations).
- Species or described sub-species that are endemic to a subbasin mostly within Oregon (i.e. limited spatial extent), but with potential for potamodromy within their distribution. Species List: Oregon Chub, Warner Sucker, Lost River Sucker, Shortnose Sucker, Pluvial Warner and Goose lake Basin Tui Chub, Goose Lake Lamprey, Goose Lake Sucker, Modoc Sucker, Miller Lake Lamprey, Pluvial Lake Chewaucan Basin Tui Chub, Pluvial Guano Basin Tui Chub, Alvord Chub, Jenny Creek Sucker.
Priority 3: Does not contain any species or habitat listed within Aquatic Species of Concern priority ranks 1 or 2, and does include at least one of the following species of habitats, using best available distribution data:
- Species or described sub-species that inhabit endorheic basins that are only partially in Oregon, but mostly occur in subbasins outside of Oregon (i.e. peripheral in Oregon but not spatially limited rangewide). Species List: California Roach, Lahontan Redside Shiner, Tahoe Sucker, Pit Sculpin.
- Species or described sub-species that 1) inhabit exorheic basins that are only partially in Oregon, but mostly occur in subbasins outside of Oregon (i.e. peripheral in Oregon but not spatially limited rangewide), or 2) have undefined taxonomic status or poorly known distribution. Species List: Margined Sculpin, Pit-Klamath Brook Lamprey, Upper Klamath Lake Lamprey, Klamath River Lamprey, Slender Sculpin.
Priority 4: Does not contain any species or habitat listed within Aquatic Species of Concern priority ranks 1, 2 or 3. Area has been documented as containing source waters that are potentially fishless, but are adjacent to waters with salmonid distribution.
Priority 5: Does not contain any species of habitat listed within Aquatic Species of Concern priority ranks 1 through 4, but does contain documentation of a water body.
Priority 6: Does not contain any documented freshwater resources.
Input Layer Definitions
Most species and habitats analyzed for the Aquatic Species of Concern layer are listed to provide more specific information about their documented presence within a hexagon. For all species and habitats listed, value definitions are: 0 = Species or habitat distribution has not been documented within hexagon, and 1 = Species or habitat distribution documented as occurring within hexagon. Additional species and habitats analyzed, but not presented in species specific results due to data sensitivity include: Foskett dace, Hutton chub, Borax chub, Oregon chub, and cold water spring sources.
Data Source
Dataset Name |
Dataset Description |
Data Steward |
ODFW Fish Distribution Data |
Data describes areas of suitable habitat believed to be used currently or historically by wild, natural, and/or hatchery fish populations. This information is based on sampling, the best professional opinion of Oregon Dept. of Fish and Wildlife or other natural resources agency staff biologists or modeling. |
ODFW |
Oregon water body boundaries. |
Various polygon datasets portraying water bodies such as sounds, bays, lakes, ponds, wetlands, reservoirs, inundation areas, the double lined portions of streams and other hydrographic features best represented as areas. |
ODFW |
Various ODFW Rare and Endemic Fish Species Distributions and Reports |
Additional distribution data, descriptions, and reports covering rare and/or endemic fish species throughout Oregon, that are not included in the ODFW Fish Distribution data. Please contact ODFW for additional details on particular species and locations. |
ODFW |
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