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| NAS - Nonindigenous Aquatic Species |
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Common Name: prickly sculpin
Taxonomy: available through 
Identification: Moyle (1976a); Morrow (1980); Page and Burr (1991).
Size: 30 cm.
Native Range: Pacific Slope drainages from Seward, Alaska, to Ventura River,
California; east of Continental Divide in upper Peace River, British
Columbia (Page and Burr 1991).
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Interactive maps: Continental US, Alaska, Hawaii, Caribbean
Nonindigenous Occurrences: This species is known from the Santa Clara River system, California (U.S. Fish and Wildlife Service 1977b; Bell 1978).
Means of Introduction: Apparently introduced in imported water, possibly with water released into Piru Creek, a tributary of the Santa Clara River, from Pyramid Reservoir during the 1970s (Bell 1978).
Status: Established in California.
Impact of Introduction: Unknown. The occurrence of this cottid in the Santa Clara River system has been viewed as a possible threat to the survival of the Federally endangered unarmoured threespine stickleback Gasterosteus aculeatus williamsoni (U.S. Fish and Wildlife Service 1977b).
Remarks: According to Bell (1978), this species and others would have survived passage through pumping and power plants in route to Pyramid Reservoir before colonizing the Santa Clara River system. Cottus asper is capable of surviving in a wide range of habitats including disturbed sites; it is also known to prey on salmon eggs and fry (Moyle 1976a).
Page, L. M., and B. M. Burr. 1991. A field guide to freshwater fishes of North America north of Mexico. The Peterson Field Guide Series, volume 42. Houghton Mifflin Company, Boston, MA.
U.S. Fish and Wildlife Service. 1977b. Recovery plan for unarmored threespine stickleback, Gasterosteus aculeatus williamsoni, an endangered fish. U.S. Fish and Wildlife Service. 60 pp.
Other Resources:
FishBase Fact Sheet
Author: Pam Fuller
Revision Date: 6/12/2000 Citation for this information:
Pam Fuller. 2010. Cottus asper. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=501> Revision Date: 6/12/2000
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