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Cottus bairdii

(Rocky Mountain Bullhead)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in English:

Beard´s Sculpin, Beard's sculpin, Blob, bullhead, Cabezon, Columbia sculpin, Freshwater sculpin, Gudgeon, miller's thumb, mottled sculpin, Muddler, Rocky Mountain Bullhead, Sculpin, sea raven, Speckled sculpin

Common Names in French:

Chabot Tachet, chabot tacheté, Chabot tacheté

Common Names in Haida:

Hl´aama, Hl'aama

Common Names in Mandarin Chinese:

南方杜父魚, 南方杜父鱼, 断线杜父鱼, 斷線杜父魚

Common Names in Tsimshian:

K´ayeet, K'ayeet

Description

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Physical Description

Species Cottus bairdii

Body: Mouth and snout: Terminal and very wide, with bands of fine teeth in bands on upper and lower jaws . No barbels . Snout rounded to blunt and dorsal-ventrally flattened. Body patterning, color, and scales : Mottled with irregular blotches, dark brown or black on a brown background with a cream or whitish belly. No scales, but a few fine prickles anteriorly just below the lateral line. Fins with brownish speckles, spots, and/or blotches. Body shape and size: Body dorsal-ventrally flattened, especially anteriorly. Typically 35-100 mm (1.5-4 in) TL ; maximum about 137 mm (5.5 in).

Fins: Tail, dorsal and other fins: Rounded or square tail. Two dorsal fins, slightly connected, the anterior with 6-9 flexible spines and the posterior with 17-19 rays (counting last forked ray as one). Pelvic fins thoracic , each with 1 spine and 4 rays. No adipose fin . Anal fin with 13-15 rays (counting last forked ray as one) and no spines.

Distinguishing characteristics: The mottled sculpin can be distinguished by its pair of free and independent pelvic fins and its lack of scales. See also similar species information.

Breeding adults : Male may become very dark, with an orange edge to the first dorsal fin.

Juveniles : Similar to adults.

Size/Age/Growth

Males are commonly 8 cm (Total Length) in length when caught/marketed, but may be as large as 15 cm (Total Length).

Habitat

Occurs in rubble and gravel riffles, less often in sand-gravel runs of headwaters , creeks and small rivers . Also found in springs and their effluents and rocky shores of lakes .

Biology

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Diet

Feeds mainly on aquatic insect larvae, but also on crustaceans, annelids , fishes , fish eggs , and plant material [1].

Reproduction

Spawns in the spring [1].

Taxonomy

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Synonyms

Cottus bairdiCottus bairdi Girard • Cottus bairdi Girard, 1850 • Cottus bairdii bairdii Girard • Cottus bairdii kumlieni (Hoy • Cottus bairdii punctulatus (Gill • Cottus bairdii semiscaber Cope • Cottus bendirei (Bean • Cottus girardi Robins • Cottus hubbsi Bailey & Dimick • Cottus hubbsi Bailey & Dimick • Cottus ictalops (Rafinesque • Cottus meridionalis Girard • Cottus richardsoni Agassiz • Cottus semiscaber Cope • Potamocottus punctulatus Gill • Uranidea kumlieni Hoy • Uranidea richardsoni (Agassiz

Notes

Name Status: Accepted Name .

Comment: Species spelling from Eschmeyer, pers. comm.

Similar Species

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Fish Name Pelvic Rays Prickles Lateral Line Dorsal Fins Gill Membranes Exposed (not covered with skin) Preoperculer Spines Midline Chin Pores Palatine Teeth Ratio of Caudal Peduncle Length to Post-Orbital Distance Similarity Index Comments Deepwater Sculpin 3 Few, just above lateral line Complete, or nearly so 1st and 2nd clearly separate Narrowly joined, meet at acute angle 2-4; largest greater than or equal to 1/2 of eye diameter in length 1-2? Present less than or equal to 1 Very similar Mottled Sculpin 4 Few, below lateral line Ends below 2nd dorsal fin 1st and 2nd touching Broadly joined, meet at shallow angle 1; ~1/2 of eye diameter in length 2 Usually present less than or equal to 1 N/A Moderately similar to round goby and tubenose goby, but distinguishable by its pair of free and independent pelvic fins and its lack of scales. In the gobies, the two pelvic fins are fused to form a disk and scales are present. Slimy Sculpin 3 Few, below lateral line Ends below 2nd dorsal fin 1st and 2nd touching Broadly joined, meet at shallow angle 1; ~1/2 of eye diameter in length 2 Usually absent greater than or equal to 1 Very similar Spoonhead Sculpin 4 Many, on head and back Complete 1st and 2nd touching Broadly joined, meet at shallow angle 1; greater than 2/3 of eye diameter in length 1 Absent less than or equal to 1 Very similar

Members of the genus Cottus

ZipcodeZoo has pages for 98 species and subspecies in this genus:

C. affinis (Rough Sculpin) · C. aleuticus (Coastrange Sculpin) · C. amblystomopsis (Sakhalin Sculpin) · C. asper (Prickly Bullhead) · C. asperrimus (Rough Sculpin) · C. aturi (Adour Sculpin) · C. australis (Eastern Fortesque) · C. baicalensis (Big-Headed Sculpin) · C. baileyi (Black Sculpin) · C. bairdi (Freshwater Sculpin) · C. bairdii (Rocky Mountain Bullhead) · C. bairdii bairdii (Freshwater Sculpin) · C. bairdii hubbsi (Columbia Mottled Sculpin) · C. bairdi bairdi (Freshwater Sculpin) · C. bairdi hubbsi (Columbia Mottled Sculpin) · C. beldingi (Paiute Sculpin) · C. beldingii (Paiute Sculpin) · C. bendirei (Malheur Sculpin) · C. bicornis (Twohorn Sculpin) · C. bubalis (Longspined Sea-Scorpion) · C. caeruleomentum (Blue Ridge Sculpin) · C. carolinae (Banded Sculpin) · C. carolinae carolinae (Banded Sculpin) · C. carolinae infernatis (Banded Sculpin) · C. cataphractus (Armed Bullhead) · C. cognatus (Western Slimy Sculpin) · C. cognatus cognatus (Western Slimy Sculpin) · C. cognatus gracilis (Bear Lake Bullhead) · C. confusus (Shorthead Sculpin) · C. czerskii (Cherskii's Sculpin) · C. diceraus (Antlered Sculpin) · C. duranii (Dordogne Sculpin) · C. echinatus (Utah Lake Sculpin) · C. extensus (Bear Lake Sculpin) · C. girardi (Potomac Sculpin) · C. gobio (Freshwater Sculpin) · C. gobio gobio (Freshwater Sculpin) · C. gobio jaxartensis (Bullhead) · C. gracilis (Yellow-Fin Baikal Sculpin) · C. greenei (Shoshone Sculpin) · C. grunniens (Grunting Toadfish) · C. gulosus (Riffle Sculpin) · C. haemusi (Vit Sculpin) · C. hemilepidotus (Red Irish Lord) · C. hispaniolensis (Pyrrenean Sculpin) · C. hubbsi (Columbia Sculpin) · C. hypselurus (Wood River Sculpin) · C. bairdii (Longfin Baikal Sculpin) · C. jaok (Plain Sculpin) · C. japonicus (Red Baikal Sculpin) · C. kazika (Baunt Sand Sculpin) · C. kessleri bauntovi (Baunt Sand Sculpin) · C. klamathensis (Marbled Sculpin) · C. kneri (Stone Sculpin) · C. koshewnikowi (Volga Sculpin) · C. leiopomus (Wood River Sculpin) · C. lilljeborgii (Norway Bullhead) · C. maculatus (Vitim Sculpin) · C. marginatus (Margined Sculpin) · C. bairdii (Southern Miller's Thumb) · C. metae (Save Sculpin) · C. microstomus (Baltic Sculpin) · C. monopterygius (Atlantic Alligatorfish) · C. nasalis (Tubenose Sculpin) · C. niger (Warthead Sculpin) · C. octodecemspinosus (Long-Spined Sculpin) · C. otaitensis (Frill-Lip Flathead) · C. paulus (Pygmy Sculpin) · C. perifretum (Bullhead) · C. perplexus (Reticulate Hookjaw Moray) · C. pistilliger (Threaded Sculpin) · C. pitensis (Pit Sculpin) · C. platycephalus (Belligerent Sculpin) · C. poecilopus (Siberian Bullhead) · C. poecilopus poecilopus (Mottlefoot Sculpin) · C. poecilopus volki (Alpine Bullhead) · C. pollux (Japanese Fluvial Sculpin) · C. polyacanthocephalus (Great Sculpin) · C. princeps (Klamath Lake Sculpin) · C. paulus (Pygmy Sculpin) · C. quadricornis (Alaska Fourhorn Sculpin) · C. rhenanus (Rhine Sculpin) · C. rhothea (Torrent Sculpin) · C. rhotheus (Torrent Sculpin) · C. ricei (Rice´s Sculpin) · C. rondeleti (H?rault Sculpin) · C. scaber (Rough Flat Head) · C. scaturigo (Timavo Sculpin) · C. scorpius (Daddy Sculpin) · C. sibiricus (Siberian Miller's Thumb) · C. spinulosus (Turkestan Sculpin) · C. tenuis (Slender Sculpin) · C. thomsonii (Pallid Sculpin) · C. transsilvaniae (Arges Sculpin) · C. tricuspis (Arctic Staghorn Sculpin) · C. uncinatus (Arctic Hookear Sculpin) · C. verrucosus (Warty Sculpin) · C. villosus (Woods' Clingfish)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal February 29, 2008:

Identifiers

Footnotes

  1. Scott, W.B. and E.J. Crossman (1973). Freshwater fishes of Canada. Bull. Fish. Res. Board Can. 184:1-966. [back]
Last Revised: 7/15/2012