| ||Acipenser acutirostris Ayres, 1854:2 (The Pacific, v. 4, nº 1), San Francisco, California.|
| ||Acipenser aleutensis Fitzinger, 1836:285, in Fitzinger & Heckel, 1836 (Ann. Wien. Mus. Naturges, vol. 1, nº 12), Canaga I., Aleutian Is., Alaska.|
| ||Acipenser brachyrynchus Ayres, 1854:2 (The Pacific, v. 4, nº 1), San Francisco, California.|
| ||Acipenser (Antaceus) ayresii Duméril, 1867:171, Pl. 12 (figs. 1-1b); Pl. 16 (fig.3), (Nouv. Arch. Mus. Hist. Nat., Paris, v. 3), San Francisco, California.|
| ||Acipenser (Antaceus) caryi Duméril, 1867:169, Pl.12 (figs.2, 2a-b), ( Ibid.), San Francisco, California.|
| ||Acipenser (Antaceus) putnami Duméril, 1867:178, Pl.13 (figs.1, 1a-b), (Ibid.), San Francisco, California.|
|En - White sturgeon, Fr - Esturgeon blanc, Sp - Esturión blanco.|
3Alpha Code: APN Taxonomic Code: 1170100109|
|Scientific Name with Original Description|
|Acipenser transmontanus Richardson, 1836: 278, Pl. 97 (fig.2). Fauna Boreali-Americana Part 3 Vancouver, Washington, USA, Fort Colville, Columbia River.|
|Spiracle present. Snout and caudal peduncle subconical. Gill membranes joined to isthmus. Mouth transverse.
Gill rakers long, 34-36 on first arch.
D: 44-48, A: 28-30 rays;
11-14 dorsal scutes, large, pointed; 38-48 lateral scutes, large, diamond-shaped; 9-12 ventral scutes. No scutes between dorsal and caudal or anal and caudal fins; 8 or 9 small scutes, in pairs between anus and anal fulcrum. Body covered with patches of very minute dermal denticles, and sometimes secundary rows of small scutes between usual rows.
Dorsal surface dark to lighter grey, pale olive, or grey-brown, sometimes speckled with white. Sides pale grey to white. Ventral surface white. Fins dusky to opaque grey. Viscera pale black and heavily pigmented.
|Pacific coast and rivers of North America from the Gulf of Alaska to Baja California (Scott & Crossman, 1990). Translocated to lower Colorado, Arizona; reported from northern Baja California, Mexico (Eschmeyer et al., 1983; Lamb & Edgell, 1986; Scott & Crosman, 1990).|
|Habitat and Biology|
|This anadromous sturgeon spends most of its time in the sea. It is thought to stay close to shore in shallow water were it has been seen leaping.It has been taken in water temperatures ranging from 0.0º C to 23.3º C, in salt, brackish and fresh water.
Mature adults move grat distances and may enter fresh water in the fall and winter (Scott & Crossman, 1973).White sturgeon take a wide range of food, but about one-half of stomachs containing fish, especially eulachons (Thaleichthys pacificus), their main food item, and sculpins (Cottus spp.), sticklebacks (Gasterosteus aculeatus), and lampreys. Of the invertebrates, chironomid larvae are the most important food item followed by caryfish (Pacifastacus sp.), stoney fly larvae Ephemeroptera larvae, mysids, Daphnia spp. and freshwater copepods.|
The age at attainment of sexual maturity is variable. First spawning in Fraser River is from 11 to 22 years for males, and from 11 to 34 for females. Subsequent spawning is apparently at increasing intervals of years: in young females the interval is 4 years, and 9-11 in older females (Semakula & Larkin, 1968). The spawning period and water temperature is variable: usually May and June, at a water temperature from 8.9 to 16.7º C, but could be later for distant migrants (Scott & Crosman, 1990); March to June (Moyle, 1976); February to June in the Sacramento River, at a water temperature from 7.8 to 17.8º C, peaking at 14.4º C (Kohlhorst, 1976); spawning probably takes place over rocky bottom in swift currents, near rapids; the eggs are adhesive (Scott & Crosman, 1990).
|Maximum size: 6.10 m TL; maximum weight: 816 Kg; maximum reported age: 106 years.|
Columbia esturgeon ,
Esturgeon blanc ,
Esturgeon blanc .|
weißer Stör ,
Estorione bianco .|
Esturión blanco .|
Pacific steur .|
Jesiotr amerykanski .|
Esturión blanco .|
|UNITED KINGDOM :
White sturgeon .|
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Carl, G.C., W.A. Clemens & C.C. Lindsey - 1959 . The freshwater fishes of British Columbia B.C. Prov. Mus. Handb. (3rd revision). 5. .
192 p.. Reprinted 1977.
Clemens, W.A. & G.V. Wilby - 1961 . Fishes of the Pacific coast of Canada. Fish. Res. Bd. Canada Bull. 2nd ed. .
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180. 740 p.. Reprinted 1988.
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Page, L.M & B.M. Burr - 1991 . A field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Company, Boston. .
Quast, J.C. & E.L. Hall - 1972 . List of fishes of Alaska and adjacent waters with a guide to some of their literature. U.S. Dep. Commer., NOAA Tech. Rep. NMFS SSRF-658. .
Radtke, L. D. - 1966 . Distribution of smelt, juvenile sturgeon, and starry flounder in the Sacramento-San Joaquin Delta with observations on food of sturgeon. In J. L. Turner and D. W. Kelly (comp.) Ecological studies of the Sacramento-San Joaquin Delta. Part II Fishes of the Delta. .
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184. 966 pp..
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