Amur sturgeon

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Amur sturgeon
Japanese Sturgeon (Acipenser schrenckii) .jpg

Amur sturgeon ( Acipenser schrenckii )

Systematics
Class : Ray fins (Actinopterygii)
Subclass : Cartilage organoids (chondrostei)
Order : Sturgeon (Acipenseriformes)
Family : Sturgeon (Acipenseridae)
Genre : Acipenser
Type : Amur sturgeon
Scientific name
Acipenser schrenckii
Brandt , 1869

The Amur sturgeon ( Acipenser schrenckii ) is a species of fish from the genus of the sturgeon ( Acipenser ) that is endemic to the Amur and possibly the Sea of ​​Japan . The species is fished commercially and traded at high prices. It is in the red list of the IUCN as endangered (vulnerable) and the CITES Convention listed in Annex II.

features

The Amur sturgeon reaches an average length of 100 to 150 cm and a maximum of three meters, and a weight of up to 190 kg. There is a breathing hole. The head has an elongated indentation on the top. Two pairs of barbels sit in front of the mouth, the lower lip of which is interrupted. The body has five rows of ganoid scales , the skin between them is rough. The back has its highest point at the first of the 11 to 17 back shields. The side rows have 32 to 47 shields, the ventral rows 7 to 9 shields. The arches of the gill trap carry 36 to 45 rays. The dorsal fin has 38 to 53, the anal fin 20 to 32 soft rays. There are 6 to 8 shields each behind the dorsal and anal fin. There are two color morphs. The more common gray morph occurs from the sources of the Amur to the mouth, but not in salt water. The rarer brown variant colonizes the middle and lower Amur runs.

Way of life

Amur sturgeon feed on bottom-dwelling animals such as molluscs and fish larvae. Both morphs go to the spawning grounds in autumn , the eggs are laid on gravel in the main bed of the river between May and July. Sexual maturity is reached by males at 7 to 8 years of age, by females at 9 to 10 years of age with a length of just over a meter.

The maximum age is 65 years.

swell

  1. ^ Entry in the IUCN Red List
  2. ↑ a b c Amur sturgeon on Fishbase.org (English)
  3. ↑ a b Species Fact Sheet of the FAO
  4. ^ Minister of Supply and Services Canada: CITES Identification Guide - Sturgeons and Paddlefish: Guide to the Identification of Sturgeon and Paddlefish Species Controlled under the Convention on International Trade in Endangered Species of Wild Fauna and Flora . Wildlife Enforcement and Intelligence Division, Environment Canada, 2001, ISBN 0-660-61641-6 (English, French, Spanish, full text [PDF]).