Country Species Summary

Acipenser transmontanus in Mexico
White sturgeon

Acipenser transmontanus Richardson, 1836
Family:	Acipenseridae (Sturgeons) , subfamily: Acipenserinae	picture (Actra_u4.jpg) by Østergaard, T.
Order:	Acipenseriformes (sturgeons and paddlefishes)
Class:	Actinopterygii (ray-finned fishes)
FishBase name:	White sturgeon
Max. size:	610 cm TL (male/unsexed; Ref. 1998); max. published weight: 816.0 kg (Ref. 27436); max. reported age: 104 years
Environment:	demersal; anadromous ; depth range 1 - 122 m
Climate:	temperate; 0 - 24°C; 58°N - 24°N
Global Importance:	fisheries: commercial; aquaculture: commercial
Resilience:	Very low, minimum population doubling time more than 14 years (tm=11-34; tmax=104)
Distribution:	Eastern Pacific: Alaska Bay to Monterey, California, USA. Landlocked in Columbia River drainage, Montana, and perhaps Lake Shasta in California, USA. Translocated to lower Colorado River, Arizona in USA. Reported from northern Baja California, Mexico (Ref. 2850, 27436). Considered vulnerable in Canada (Ref. 6866). International trade restricted (CITES II, since 1.4.98).
Diagnosis:	Dorsal spines (total): 0-0; Dorsal soft rays (total): 44-48; Anal soft rays: 28-31. Distinguished by the 2 rows of 4 to 8 bony plates on a midventral line between the anus and anal fin, and about 45 rays in the dorsal fin (Ref. 27547). Gray or brownish above, paler below; fins gray (Ref. 27547).
Biology:	Spends most of its time in the sea, usually close to shore (Ref. 27547). Enters estuaries of large rivers and moves far inland to spawn (Ref. 5723). Individuals larger than 48.3 cm feed mainly on fishes; smaller ones feed mainly on chironomids, but also takes small crustaceans, other insects and mollusks (Ref. 1998). Feeding ceases just before spawning (Ref. 1998). Excellent food fish that is sold fresh, smoked or frozen (Ref. 9988). Eggs marketed as caviar (Ref. 1998). In the past, the airbladder was made into isinglass (Ref. 27547)
Threatened:	, (Ref. 36508)
Dangerous:	harmless
Coordinator:
Main Ref:	Page, L.M. and B.M. Burr. 1991. (Ref. 5723)
Update \| Add

Mexico country information
Common names:	Esturión blanco, Esturión blanco	Ref: Escobar-Fernández, R. and M. Siri, 1997
Status:	native	Ref: Lamb, A. and P. Edgell, 1986
Salinity:	freshwater, brackish, marine
Regulations:	no regulations	Ref:
Uses:	no uses
Comments:	Ranges south to northern Baja California (Ref. 2850). Also Ref. 6792, 27436.
Country Information:	www.cia.gov/cia/publications/factbook/geos/mx.html
Occurrences:	Occurrences Point map
Main Ref:	Eschmeyer, W.N., E.S. Herald and H. Hammann, 1983
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Modified: Froese, Rainer

Entered: Garilao, Cristina V.

CGNET - US

Page created by: Eli, 20.10.03, last modified by Eli, 26.06.07

	Ref.:		Glossary
		(e.g. 9948)		(e.g. cephalopods)
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