Hucho taimen#Angling and commercial use

{{Speciesbox

| image = Hucho taimen June 2007 Uur River.jpg

| image2 =

| status = VU

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Hogan, Z. |author2=Jensen, O. |date=2013 |title=Hucho taimen |volume=2013 |page=e.T188631A22605180 |doi=10.2305/IUCN.UK.2013-1.RLTS.T188631A22605180.en |access-date=19 November 2021}}

| genus = Hucho

| species = taimen

| authority = Pallas, 1773

| range_map =

| range_map_caption = Green: current range. Red: former range.

}}

Siberian taimen (Hucho taimen), also known as the common taimen ({{langx|ru|Обыкнове́нный тайме́нь|Obyknovénnyĭ taĭménʹ}}), Siberian giant trout or Siberian salmon, is a species of salmon-like ray-finned fish from the genus Hucho in the family Salmonidae. These fish are found in rivers in Siberia and adjacent regions, and are harvested throughout the year.

Habits and range

The taimen is distributed from the Volga and Pechora River basins in the west to the Yana and Amur River basins in the east, spanning portions of Russia, Kazakhstan, Mongolia, and China. On a larger scale, this includes parts of the Caspian, Arctic, and Pacific drainages in Eurasia. In Mongolia, the taimen is found in both the Arctic and Pacific drainages, specifically the Yenisei/Selenga, the Lena, and the Amur River Basins. The taimen lives in flowing water and is only occasionally found in lakes, usually near the mouth of a tributary. The taimen is not anadromous, but does show increased movement rates during the spawning season. The average home range size of taimen in the Eg-Üur rivers of Mongolia is {{convert|23|km}}, but some tagged individuals show home ranges up to {{convert|93|km}}.{{cite journal|title=Home range and seasonal movement of taimen, Hucho taimen, in Mongolia |doi=10.1111/j.1600-0633.2010.00434.x|year=2010 |last1=Gilroy|first1=D. J.|last2=Jensen|first2=O. P.|last3=Allen|first3=B. C.|last4=Chandra|first4=S.|last5=Ganzorig|first5=B.|last6=Hogan|first6=Z.|last7=Maxted|first7=J. T.|last8=Vander Zanden|first8=M. J.|journal=Ecology of Freshwater Fish|volume=19|issue=4|pages=545}} Some authors consider the taimen to be a subspecies of the huchen, i.e. Hucho hucho taimen.

Description

Coloration varies geographically, but is generally olive green on the head blending to reddish brown in the tail. Adipose, anal, and caudal fins are often dark red. The belly ranges from nearly white to dark gray. The taimen appears to be the largest salmonid in the world, being heavier at average and maximum sizes than the largest North American salmonid, the chinook salmon.Zolotukhin, S., Makeev, S., & Semenchenko, A. (2013). Current status of the Sakhalin taimen, Parahucho perryi (Brevoort), on the mainland coast of the Sea of Japan and the Okhotsk Sea. Archives of Polish Fisheries, 21(3), 205-210.De Groot, S. J. (1989). The Eurasian huchen, Hucho hucho. Largest salmon of the world: J. Holčik, K. Hensel, J. Nieslanik and L. Skaćel. Dr. W. Junk Publishers, Dordrecht, The Netherlands, 1988. 239 pp., 29 plates, partly coloured, 32 text figures, 41 tables, Dfl. 225.00; US $125.00;£ 66.00. {{ISBN|90-6193-643-8}} (also published in the series Perspectives in Vertebrate Science volume 5—{{ISBN|90-6193-897-X}} (series).Burger, C. V., Wilmot, R. L., & Wangaard, D. B. (1985). Comparison of spawning areas and times for two runs of chinook salmon (Oncorhynchus tshawytscha) in the Kenai River, Alaska. Canadian Journal of Fisheries and Aquatic Sciences, 42(4), 693-700. Most mature fish caught weigh from {{convert|15|to|30|kg|lb|abbr=on}}.[http://www.safari.ru/en/fishing/basic_programs/taimen_fishing_in_yakutia/ Safari and Expeditions — Taimen fishing in Yakutia] {{Webarchive|url=https://web.archive.org/web/20120902211044/http://www.safari.ru/en/fishing/basic_programs/taimen_fishing_in_yakutia/ |date=2012-09-02 }}. Safari.ru. Retrieved on 2012-08-23. The average length is from {{convert|70|to|120|cm|in|abbr=on}}. The maximum length is about {{convert|150|to|180|cm|in|abbr=on}}. The maximum size is not assured, but supposedly a fish caught in the Kotui River in Russia in 1943 with a length of {{convert|210|cm|in|abbr=on}} and a weight of {{convert|105|kg|lb|abbr=on}} is the largest size recorded.(Holcik et al. 1988). The IGFA world record is {{convert|45.80|kg|abbr=on|}} with a length of {{convert|150.00|cm|abbr=on|}}.{{Cite web|url=https://igfa.org/igfa-world-records-search/?search_type=CommonNameSummary&search_term_1=Taimen|title=IGFA World Records|website=IGFA|access-date=2019-12-27}} It can reach at least 55 years of age.

Diet

Adult taimen are mainly piscivores, eating fish, though they frequently eat terrestrial prey such as rodents and birds.

Angling and commercial use

The taimen is becoming a more well-known game fish, particularly for fly fishers. Catch-and-release with barbless hooks is practised in many areas to conserve dwindling populations of this species. Organizations such as the Taimen Conservation Fund are working to conserve the remaining populations. While the taimen is sometimes (often illegally) harvested commercially, its low price and slow growth and reproduction make it more valuable as a game fish.

Conservation

The taimen has been assessed as vulnerable and in decline by the International Union for Conservation of Nature (IUCN). Threats to the taimen include land-use change, such as the establishment of sand and gravel industries in Mongolia and in Heilongjiang Province, China, industrial water pollution in Europe, commercial fishing in the Amur River region of Russia and China, legal and illegal sport fishing throughout its range and the impacts of climate change. The IUCN recommends that the fish be considered for inclusion in the Convention on Migratory Species to spur international cooperation on the conservation of this fully migratory species.

Folklore

Mongolian legend tells of a giant taimen trapped in river ice. Starving herders were able to survive the winter by hacking off pieces of its flesh. In the spring, the ice melted and the giant taimen climbed onto the land, tracked down the herders, and ate them all.
According to Chinese folklore, a type of giant taimen lives in Kanas Lake in China. Villagers near Kanasi claim to have found fish weighing over 4 tonnes.[http://www.chinadaily.com.cn/english/doc/2005-07/29/content_464669.htm Exploration for "lake monsters" to launch in NW China]. Xinhua (2005-07-29).
National Geographic called the taimen the "Mongolian Terror Trout".[https://web.archive.org/web/20160303222150/http://natgeotv.com/za/hooked-monster-fishing/about About Hooked: Monster Fishing Show – National Geographic Channel – Sub-Saharan Africa]. Natgeotv.com. Retrieved on 2012-08-23.