Japan country information

Common names: Chôzame
Occurrence: native
Salinity: freshwater
Abundance: scarce (very unlikely) | Ref: Sokolovskaya, T.G., A.S. Sokolovskii and E.I. Sobolevskii, 1998
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Ranges from the Tôhoku District northward (Ref. 559); including Hokkaido (Ref. 28216, 37812). A. mustiscutatus is distributed off the Fukushima and Niigata Prefectures (Ref. 4537). Also Ref. 2850, 6866, 1998,12218. Status of threat: EX (Ref. )
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/ja.html
National Fisheries Authority: http://www.maff.go.jp/eindex.html
Occurrences: Occurrences Point map
Main Ref: Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino, 1984
National Database:

Common names from other countries

米氏鲟, 米氏鲟, Chôzame, ... more

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Chondrostei (sturgeons) > Acipenseriformes (Sturgeons and paddlefishes) > Acipenseridae (Sturgeons) > Acipenserinae
Etymology: Acipenser: Latin, acipenser = sturgeon, 1853 (Ref. 45335).
More on author: Hilgendorf.

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; freshwater; brackish; demersal; anadromous (Ref. 51243). Temperate; 56°N - 33°N, 125°E - 145°E (Ref. 54262)

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Northwest Pacific: Bering Sea, Tumnin (Datta) river, to northern Japan and Korea. This species was formerly regarded to be a population of Acipenser medirostris (Ref. 6866).

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 150 cm TL male/unsexed; (Ref. 12218)

Short description Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 33-40; Anal spines: 0; Anal soft rays: 22 - 30. Body shields in 5 rows; dorsal shields 7 to 11, lateral 22 to 36 and ventral 10.

Commercially cultured in Japan (Ref. 6866). From April to May adults feed in fresh water and return to the ocean during the fall (Ref. 12218). Generation time: 15 years (Ref. 116373).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Eggs are laid from April to August under the substrate in sandy areas (Ref. 12218).

Main reference Upload your references | References | Coordinator | Collaborators

Birstein, V.J., 1993. Sturgeons and paddlefishes: threatened fishes in need of conservation. Conserv. Biol. 7:773-787. (Ref. 6866)

IUCN Red List Status (Ref. 130435)

Critically Endangered (CR) (A2bc; C2a(i,ii)); Date assessed: 14 September 2019

CITES (Ref. 128078)

Appendix II: International trade monitored

CMS (Ref. 116361)

Appendix II: Migratory species conserved through agreements

Threat to humans

Harmless

Human uses

Fisheries: minor commercial; aquaculture: commercial

FAO(Fisheries: species profile; publication : search) | FishSource |

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Estimates based on models

Preferred temperature (Ref. 115969): 13.6 - 20.1, mean 18.3 (based on 34 cells).

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00324 (0.00142 - 0.00736), b=3.17 (2.99 - 3.35), in cm Total Length, based on LWR estimates for this Genus-body shape (Ref. 93245).

Trophic level (Ref. 69278): 3.3 ±0.3 se; based on size and trophs of closest relatives

Resilience (Ref. 120179): Very Low, minimum population doubling time more than 14 years (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Very high vulnerability (90 of 100).

Price category (Ref. 80766): Unknown.

Acipenser mikadoi Hilgendorf, 1892