Cutthroat Trout

Cutthroat Trout
Bonneville cutthroat trout, Oncorhynchus clarki utah
[Image: Utah Division of Wildlife Resources]

Cutthroat Trout
Oncorhynchus clarki

Description: Cutthroat trout are native to western North America. Fourteen subspecies of cutthroat trout are recognized.

Habitat: Some subspecies are anadromous, migrating between the ocean and freshwater, while others are found only in freshwater.


Status: Many populations have declined from overfishing, habitat loss, and hybridization with other non-native trout species.




Fishbase is a searchable global database of fish species information.

FishBase on the web contains practically all fish species known to science. Search over 28,000 fish species by common name, scientific name, ecosystem, or country. Or, use the search feature to find tools, maps, or references.

Learn more about FishBase.

Fishes of the Southwest Region

 Beautiful Shiner (Cyprinella formosa) [Photo: Bill Radke, USFWS] Beautiful Shiner (Cyprinella formosa) [Photo: Bill Radke, USFWS]
Beautiful Shiner (Cyprinella formosa)
[Photo: Bill Radke, USFWS]

Fishes are aquatic vertebrates that have fins, gills and scales. Gills are the part of a fish's respiratory system that provide surface area for exchanging oxygen and carbon dioxide under water. Fish are thought of as "cold-blooded", or ectotherms, meaning they cannot control their own body temperature; instead, they depend on the temperature of their environment. They can live in fresh or salt water, and have a range of potential diets, being herbivores, carnivores or omnivores.

Fish Species of Greatest Conservation Need
One hundred and twenty-five fish species have been identified in state wildlife action plans as Species of Greatest Conservation Need (GCN) for the Southwest Region, which includes Arizona, Colorado, Nevada, New Mexico, and Utah. The Southwest Species of Greatest Conservation Need interactive application brings together resources on these 125 GCN fish species and other GCN taxa from multiple authoritative sources including the Integrated Taxonomic Information System (ITIS) and NatureServe.

Southwest Species of Greatest Conservation NeedSpecies of Greatest Conservation Need
Browse the interactive application to find out more about the 125 fish species of greatest conservation need in the Southwest Region.

NFHAP Partnerships for Fish Habitat

NFHAP Come Together Shark [Image: National Fish Habitat Action Plan]
[Image: National Fish Habitat Action Plan]

Partnerships are a key element of the National Fish Habitat Action Plan, a collaborative effort to address a nationwide crisis for fish by addressing the loss and degradation of their habitat. Public and private partnerships developed as part of the NFHAP reflect the locally-driven nature of the Plan. NFHAP partnerships are "self-identified, self-organized, and self-directed communities of interest formed around geographic areas, keystone species, or system types". Visit the NFHAP Fish Habitat Partnerships page to find partnerships in your region through a map, descriptions, and links.

As a federal-level partner, the USGS-NBII houses the data delivery system supporting the National Fish Habitat Action Plan. Find out more about NBII's role in the NFHAP and the data associated with the Plan.

U.S. Environmental Protection Agency: Surf Your Watershed

The U.S. Environmental Protection Agency's "Surf Your Watershed" program integrates environmental information available by geographic units including state, watershed, county, metro area, and tribe.

The site provides access to three main databases:
1. Adopt Your Watershed, a database of watershed groups,
2. Wetlands Restoration Projects, which displays ongoing wetlands restoration,
3. Environmental Websites Database, a directory of websites dedicated to environmental issues and information.

Map of United States

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Featured Fisheries and Aquatic Resources Resource

NBII Fisheries and Aquatic Resources

For more information about fishes nationwide, visit the NBII Fisheries and Aquatic Resources (NBII-FAR) web site. There you can find further web resources on fishes and aquatic organisms and the diverse factors affecting aquatic resources nationally.

The NBII-FAR web site features species information and lists, population and habitat maps and data, information about endangered species, freshwater and marine fishes, and conservation initiatives such as the U.S. Fish and Wildlife Service National Fish Hatchery System.

NBII-FAR partners:

Taxonomy Helper

Integrated Taxonomic Information System (ITIS)

Bony Fishes

    Kingdom: Animalia
    Division: Chordata
    Subdivision: Vertebrata
    Superclass: Osteichthyes
The NBII Program is administered by the Biological Informatics Program of the U.S. Geological Survey
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