Dallia pectoralis Bean, 1880

Alaska blackfish

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

Classification	Actinopterygii \| Esociformes \| Umbridae
Synonyms	... more
Common names	Dallia, Fächerfisch, 阿拉斯加黑鱼, ... more

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Image of Dallia pectoralis (Alaska blackfish)

Picture by Whitman, M.

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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 : 33.0 cm TL male/unsexed; (Ref. 5723); common length : 10.8 cm TL male/unsexed; (Ref. 12193); max. published weight: 366 g (Ref. 28675); max. reported age: 8 years (Ref. 12193)

Environment

Demersal; freshwater

Climate / Range

Boreal; 4°C - 14°C (Ref. 2059); 72°N - 55°N

North America: Alaska from Colville River delta south to central Alaska Peninsula near Chignik; upstream in Yukon-Tanana drainage to near Fairbanks. Also Bering Sea islands and northeastern Siberia, Russia.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 0; Dorsal soft rays (total): 10 - 14; Anal spines: 0; Anal soft rays: 12 - 16; Vertebrae: 40 - 42. Identified by its short, flattened snout, the rearward location of the dorsal and anal fins, the presence of about 33 rays in the pectorals, and the presence of a pelvic fin that has only 3 rays (Ref. 27547). Gill rakers short; lateral line with minute pores: 76 to 100 scales in midlateral series (Ref. 27547). Dorsal located far back on body; anal more or less under dorsal; edge of pectorals rounded; pelvic fins very small and located just before anus; caudal broad and rounded (Ref. 27547). Dark green or brown above and on upper sides, pale below with dark speckles; four to six irregular dark bars or blotches on sides; fins have dark brownish specklings; dorsal, anal and caudal fins with pale margin, which are pink to red in spawning adults (Ref. 27547).

Usually found in heavily vegetated swamps and ponds; occasionally in medium to large rivers and lakes with abundant vegetation (Ref. 5723). Migrations appear to be limited to inshore or upstream movements to spawning grounds in the spring and (presumably) reverse migrations to deeper water in the fall (Ref. 27547). Oviparous, batch spawner (Ref. 205). Known for their tolerance to cold water: survives exposures to -20°C for up to 40 minutes, and can survive for a few days after complete freezing of parts of the body, even the head (Ref. 28673, 28674). Uses its esophagus as auxiliary breathing organ (Ref. 27797).


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

Human uses
Fisheries: subsistence fisheries; aquarium: commercial


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

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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=2-3; tmax=8; Fec=40-300)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Low to moderate vulnerability (31 of 100)	Not marketed/unknown

Entered by Froese, Rainer

Modified by Luna, Susan M.

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Page last modified by : elaxamana, 15 July 2009

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