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Common name (e.g. trout)
Genus + Species (e.g. Gadus morhua)
Classification / Names
| Catalog of Fishes (
Actinopterygii (ray-finned fishes) >
(Scorpionfishes and flatheads) >
Greek, kottos = a fish (Ref.
Named after Mr. Fred Chamberlain, naturalist of the steamer Albatross, who collected the type (Ref.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; brackish; demersal; depth range 6 - 128 m (Ref.
). Temperate; 4°C - 16°C (Ref.
); 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.
Length at first maturity / Size / Weight / Age
range ? - ? cm
Max length : 12.1 cm TL male/unsexed; (Ref.
); common length : 7.5 cm TL male/unsexed; (Ref.
); max. reported age: 7 years (Ref.
(total): 7 - 10;
: 10 - 14;
: 31 - 35. Distinguished by the two pores on the chin and the short lateral line ending under the second dorsal fin (Ref.
). 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.
). Pectorals large and fan-shaped, tips of lower rays projecting; fourth ray of pelvic much reduced; caudal rounded (Ref.
). 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.
Inhabits rocky riffles of cold streams, rocky areas of lakes (commonly at 90-106 m depth), springs and their effluents (Ref.
). Moves into shallow water to spawn (Ref.
). In some areas, they are common in brackish water (Ref.
), presumably moving to and from fresh water, at least for spawning (Ref.
). Feeds mostly on aquatic insect larvae and nymphs but also on crustaceans, small fishes, and plant materials (Ref.
). May be used as bait, but this seems rare (Ref.
The male chooses a nesting site under a rock or ledge. Spawning males are territorial toward other males (Ref.
). He attracts a female into the nesting site and after more courting the female deposits her adhesive eggs. The female is then driven out and the male guards the eggs until hatching occurs. The nest usually contains eggs from several females (Ref.
). The male has also been observed to guard the young (Ref.
Page, L.M. and B.M. Burr
, 1991. A field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Company, Boston. 432 p. (Ref.
IUCN Red List Status (Ref.
Least Concern (LC)
; Date assessed:
09 November 2011
Threat to humans
Fisheries: of no interest; aquarium: public aquariums
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Websites from users
Catalog of Fishes
| IGFA World Record |
Otolith Atlas of Taiwan Fishes
| Reef Life Survey |
Tree of Life
) | World Records Freshwater Fishing |
Estimates of some properties based on models
Phylogenetic diversity index (Ref.
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00759 (0.00341 - 0.01686), b=3.11 (2.92 - 3.30), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref.
Trophic Level (Ref.
): 3.4 ±0.47 se; Based on food items.
): Medium, minimum population doubling time 1.4 - 4.4 years (tm=2-4; tmax=7; Fec=42-1,420).
): Moderate to high vulnerability (50 of 100) .
Garilao, Cristina V.
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- 20 July 2016
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