Cottus cognatus Richardson, 1836

Slimy sculpin

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Scorpaeniformes \| Cottidae
Synonyms	Cottus boleoides, Cottus chamberlaini, Cottus formosus, ... more
Common names	Western slimy sculpin, Anadyr sculpin, Bear Lake bullhead, ... more

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Image of Cottus cognatus (Slimy sculpin)

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Main reference

Page, L.M. and B.M. Burr. 1991. (Ref. 5723)
Other references | Biblio | Coordinator | Collaborators

Size / Weight / Age

Max length : 12.1 cm TL male/unsexed; (Ref. 27547); common length : 7.5 cm TL male/unsexed; (Ref. 27547); max. reported age: 7 years (Ref. 28921)

Environment

Demersal; freshwater; brackish; depth range 6 - 128 m (Ref. 1998)

Climate / Range

Temperate; 4°C - 16°C (Ref. 13614); 71°N - 37°N

North America: throughout most of mainland Canada and Alaska; Atlantic Slope drainages south to Potomac River in Virginia, USA; St. Lawrence-Great Lakes basin; upper Mississippi River basin in Wisconsin, Minnesota and Iowa, USA; upper Columbia River drainage in Canada and USA. Also in Siberia, Russia.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 7 - 10; Dorsal soft rays (total): 14 - 19; Anal spines: 0; Anal soft rays: 10 - 14; Vertebrae: 31 - 35. Distinguished by the two pores on the chin and the short lateral line ending under the second dorsal fin (Ref. 27547). Gill rakers short and stubby, about 6 on first gill arch; lateral line incomplete, ending under middle of soft dorsal fin and usually having a few isolated pores behind this point; main portion with 12 to 26 pores (Ref. 27547). Pectorals large and fan-shaped, tips of lower rays projecting; fourth ray of pelvic much reduced; caudal rounded (Ref. 27547). Rather dark brown or green to dark gray on back and sides, whitish below, with vague, dark mottlings or bars below soft dorsal; belly sometimes with orange tints; soft dorsal, pectoral and caudal fins usually barred, pelvic fins and anal usually immaculate but sometimes barred; spiny dorsal dark at base, with a clear margin that may turn orange in breeding males; breeding males usually dark, sometimes black, all over (Ref. 27547).

Inhabits rocky riffles of cold streams, rocky areas of lakes (commonly at 90-106 m depth), springs and their effluents (Ref. 5723). Moves into shallow water to spawn (Ref. 27547). In some areas, they are common in brackish water (Ref. 27843), presumably moving to and from fresh water, at least for spawning (Ref. 27547). Feeds mostly on aquatic insect larvae and nymphs but also on crustaceans, small fishes, and plant materials (Ref. 1998). May be used as bait, but this seems rare (Ref. 27547).


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses
Fisheries: of no interest; aquarium: public aquariums


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

Tools
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Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-4; tmax=7; Fec=42-1,420)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Moderate to high vulnerability (50 of 100)	Low

Entered by Froese, Rainer

Modified by Garilao, Cristina V.

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Page last modified by : elaxamana, 15 July 2009

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