It is currently only known to spawn persistently in the Tumnin River (not further than 100 km upstream from the estuary), where only a single spawning site is known. It has also rarely been found in the Koppi River. This population may be functionally dependent on the Tumnin River or simply ephemeral (Shmigirilov et al. 2007).
Habitat and Ecology
Estuaries are thought to be the nursery grounds for the species. They are mainly benthic feeding and feed in higher salinity waters (than Amur and Kaluga which share range), where food resources are more abundant than in temperate coastal watersheds (Shmigirilov et al. 2007).
The species generation length is estimated to be 15 years, with first maturation around 8-10 years (based on similarity to A. medirostris).
Life History and Behavior
Molecular Biology and Genetics
Statistics of barcoding coverage: Acipenser mikadoi
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
IUCN Red List Assessment
Red List Category
Red List Criteria
Current population estimates range from ten to thirty adults entering the Tumnin River for spawning annually. In 2005 only three specimens were caught and two specimens in 2008 - these were used for the establishment of aquaculture stocks.
Bycatch is a threat to the species as there is a lot of trawling off the coast. Pollution and the potential construction of dams is also a threat to the species.
Considering the low abundance of this species, research should focus on investigating potential environmental limiting factors (especially estuarine conditions), determining survival rates of the age stages and fecundity (Shmigirilov et al. 2007).
Conservation aquaculture techniques have been developed since 1995.
Public education, applied management research, and experimental research are necessary to develop better plans for protecting these species from extinction.
International trade is restricted (CITES II, since 1998; CMS Appendix II). Commercially cultured in Japan, and there is a large stock in Sakhalin which has originated from Tumnin spawners.
Relevance to Humans and Ecosystems
Environment[edit source | edit]
The Sakhalin sturgeon is known to be found in either a marine or freshwater environment within demersal depth range. This species is found in brackish waters. They are also native to a tropical climate.
Size[edit source | edit]
The Sakhalin sturgeon has reached the maximum recorded length of about 150 centimeters or about 59 inches as an unsexed male. 
Biology[edit source | edit]
The Sakhalin sturgeon is considered to be a species that migrates up the river from the sea in order to spawn. During the months of April to May, the Sakhalin sturgeon feeds in the freshwater and then returns to the ocean during the summer. 
Identification[edit source | edit]
The Sakhalin sturgeon is recorded to be the colors of olive-green and dark green. Its sides have a yellowish white color and it includes an olive green stripe. The bottom lip of this species is split into two. 
Distribution[edit source | edit]
The Sakhalin sturgeon is commonly found in the areas of Northwest Pacific, Bering Sea, Tumnin or Datta river, northern Japan, and Korea. This species currently spawns persistently in the Tumnin River.
Threats[edit source | edit]
The threats that are affecting the population of the Sakhalin sturgeon include illegal poaching, trawling, accidental bycatch, pollution, and construction of dams.
Common names[edit source | edit]
The common names of the Sakhalin sturgeon in various languages include the following:
- Acipenser mikadoi : Italian (Italiano)
- Chôzame : Japanese (日本語)
- Jeseter severní : Czech (česky)
- Mikadosampi : Finnish (suomen kieli)
- Sakhalin sturgeon : English
- сахалинский осетр : Russian (русский язык)
- 米氏鱘 : Mandarin Chinese
- 米氏鲟 : Mandarin Chinese
References[edit source | edit]
- "Acipenser mikadoi Hilgendorf, 1892 Sakhalin sturgeon". Fish Base. Retrieved 2 August 2013.
- "Acipenser mikadoi — Overview Sakhalin Sturgeon". Encyclopedia of Life. Retrieved 2 August 2013.
- "Sakhalin Sturgeon". Pond Life. Retrieved 2 August 2013.
- "Acipenser mikadoi". International Union for Conservation of Nature and Natural Resources. Retrieved 2 August 2013.
- "Sakhalin sturgeon". The Website of Everything. Retrieved 2 August 2013.
Source[edit source | edit]
- Sturgeon Specialist Group 1996. Acipenser mikadoi. 2006 IUCN Red List of Threatened Species. Downloaded on 3 August 2007.
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