Amur sturgeon
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The Amur sturgeon or Japanese sturgeon (Sinosturio schrenckii) is a species of fish in the family Acipenseridae found in the Amur River basin in China and Russia. They migrate outwards to the Sea of Japan and the Sea of Okhotsk.[1] The species has 11–16 dorsal, 34–47 lateral, and 7–16 ventral scutes. Their dorsal fins have 38–53 rays and 20–35 anal fin rays. They also have greyish-brown backs and pale ventral sides. The species can reach up to Script error: No such module "convert". in length, and weigh over Script error: No such module "convert"..[2] The species is considered to be critically endangered.[3]
Prior to 2025, it was placed in the genus Acipenser. However, this placement was long known to be paraphyletic. In 2025, it was moved to the revived genus Sinosturio.[1][4]
Habitat and ecology
The Japanese sturgeon is benthic. Their main food sources are aquatic insect larvae, bony fish and mollusks. One study suggests that the type of aquatic insect larvae eaten by juvenile Japanese sturgeon depends on the season, where mayfly nymphs are eaten more frequently in spring and fall, and midge larvae are eaten more frequently in summer.[5] The females mature at 9–10 years of age, and males at 7–8 years. They start to migrate in the autumn. They live for 65 years.[2]
References
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Further reading
- Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino (1984). The fishes of the Japanese Archipelago. Vol. 1 (text). Tokai University Press, Tokyo, Japan. 437 p. (text), 370 pls.
- Journal Coll. Sci. Imp.Univ.,Tokyo, "23", (7).
- Global Biodiversity Information Facility http://data.gbif.org/species/13576254/. Viewed 27 January 2010.