TheSakhalin taimen(Parahucho perryi,syn.Hucho perryi), also known as theJapanese huchenorstringfish(Japanese:Y phú /イトウ,romanized:itō), is a large species ofsalmonidfreshwater fishinNortheast Asia,found in the lakes and large rivers ofPrimorsky,Khabarovsk,SakhalinandKuril IslandsofFar Eastern Russia,as well asHokkaidoofJapan.Although often placed in the genusHucho,molecular phylogeneticand other evidence has shown that it belongs in its ownmonotypicgenusParahucho.[3][4][5][6]
| Sakhalin taimen | |
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Scientific classification
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Salmoniformes |
| Family: | Salmonidae |
| Subfamily: | Salmoninae |
| Genus: | Parahucho Vladykov, 1963 |
| Species: | P. perryi
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| Binomial name | |
| Parahucho perryi (Brevoort,1856)
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| Synonyms[2] | |
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The population has been in general decline for a century at least, with contributory factors including degradation of the environment by logging, oil exploration and change of land use to agriculture. The fish is caught bycommercial fishingasbycatch,byrecreationalanglersand illegally bypoaching,and present populations are estimated to be less than 5% of their historic levels. TheInternational Union for Conservation of Naturehas rated the fish as beingcritically endangered.[1]
Description
editParahucho perryiis one of largest, most ancient salmon species and primarily inhabits the lower to middle reaches of lakes and rivers. Fish over 30 cm (1 ft) long are almost exclusivelypiscivores,while the young feed mostly on aquatic insects. Females typically lay between 2,000 and 10,000 eggs in the spring on the sandy or gravelly river bottom.[7]The average specimens caught have weighed around 5 kg (11 lb).[1]The largest fish caught was recorded at 9.45 kg (20.8 lb) (IGFAworld record). According to an unverified record from Japan, a fish with length of 2.1 m (6.9 ft) was captured in 1937 from theTokachi River,Hokkaidō.[citation needed]
Distribution
editParahucho perryiare found in the Northwest Pacific:SakhalinIsland (Russia), the Island ofHokkaidō(Japan), and parts of the far eastern Russian mainland. Some populations spend all their lives in freshwater while others areanadromous.The fish take about eight years to mature and can spawn several times during their lifetime which is estimated to be about fourteen years.[1]
Threats
editThe global population of the species has dwindled in recent years for a variety of reasons. The loss of more than 50% of their original habitat due to agriculture, urbanization, and more recently, oil and gas development, is a major factor. Other considerable pressures includebycatchin the commercial salmonfisheriesof Russia and Japan, as well asillegal fishingpractices in Russia. The fish are also prized as trophies by Japanese recreational anglers.[8]
In Japan, this species is bred for game-fishing at managed fishing sites, and raised fish are available for purchase. However, the species remains critically endangered.
Status
editSince 2006, theIUCNhas listedParahucho perryiascritically endangeredbased on the assessment completed by the Salmonid Specialist Group. This designation represents the highest potential risk of global extinction to the species. The assessment revealed that the range-wide population has dropped in size to less than 5% of historic levels.[8]
References
edit- ^abcdRand, P.S. (2006)."Hucho perryi".IUCN Red List of Threatened Species.2006:e.T61333A12462795.doi:10.2305/IUCN.UK.2006.RLTS.T61333A12462795.en.Listed as Critically Endangered (CR A4abcd v3.1)
- ^"Parahucho perryi".Global Biodiversity Information Facility.Retrieved2023-01-26.
- ^Froese, Rainer;Pauly, Daniel (eds.)."Parahucho perryi".FishBase.August 2016 version.
- ^Oleinik, A.G.; and Skurikhina, L.A. (2008). Phylogenetic relationships of Sakhalin taimen Parahucho perryi inferred from PCR-RFLP analysis of mitochondrial DNA. Russian Journal of Genetics, 44:767.doi:10.1134/S102279540807003X
- ^Matveev, V.; Nishihara, H.; & Okada, N. (2007). Novel SINE families from salmons validate Parahucho (Salmonidae) as a distinct genus and give evidence that SINEs can incorporate LINE-related 3′-tails of other SINEs. Molecular Biology and Evolution 24(8): 1656-1666.doi: 10.1093/molbev/msm083
- ^Campbell, Matthew A.; Buser, Thaddaeus J.; Alfaro, Michael E.; López, J. Andrés (2020-07-03)."Addressing incomplete lineage sorting and paralogy in the inference of uncertain salmonid phylogenetic relationships".PeerJ.8:e9389.doi:10.7717/peerj.9389.ISSN2167-8359.PMC7337038.PMID32685284.
- ^Robins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea and W.B. Scott, 1991. World fishes important to North Americans. Exclusive of species from the continental waters of the United States and Canada. Am. Fish. Soc. Spec. Publ. (21):243 p.(from fishbase, Hucho perryi)
- ^abRand, Pete."Ancient, Giant Salmon in Asia Edging Towards Extinction"Archived2011-11-09 at theWayback MachineWild Salmon Center, May 23, 2006.