Arctic Grayling - Thymallus arcticus
State Rank Reason (see State Rank above)
The Arctic Grayling is currently ranked "S1" in Montana because it is at extremely high risk of extirpation in the state due to very limited and/or rapidly declining population numbers, range and/or habitat.
The Arctic Grayling is a species native to northern North America. The only populations native to the lower 48 states were in Michigan and Montana, and the Michigan population is now extinct. Consequently, the fluvial or river-dwelling population in the upper Big Hole River are the last remnants of this native Fish of Special Concern. Originally, the fluvial Arctic Grayling was widespread throughout the upper Missouri river drainage as far downstream as Great Falls. Lewis and Clark made note of these "new kind of white or silvery trout" in 1805. The lake-dwelling form is fairly common in 30 or more lakes across the western half of the state. These lake fish are genetically, but not visibly, different from our native fluvial Arctic Grayling. Grayling are gullible to the angler's lures and also seem to be easily out-competed by other salmonid species. This probably explains much of their demise from their native range. They are spring spawners and broadcast their eggs over a gravel bottom in moving streams. Grayling can overpopulate, producing severely stunted populations in some mountain lakes. Grayling are truly a unique Montana species. The iridescent hues of a spawning grayling's dorsal fin are brilliant. Exceptional individuals can weigh up to 3 pounds and reach 20 inches in length. They are generalists, eating a variety of aquatic invertebrates (Montana Fish, Wildlife, and Parks).
For a comprehensive review of the ecology, conservation status, threats, and management of this and other Montana fish species of concern, please see Montana Chapter of the American Fisheries Society Species of Concern Status Reviews.
The Montana Arctic grayling has a large, sail-like dorsal (back) fin and colorful body markings. The grayling comes in a wide array of colors. Their dorsal fins are typically fringed in red and dotted with large iridescent red, aqua, or purple spots and markings. These colorful markings are most dramatic on large grayling.
Western Hemisphere Range
Arctic grayling are native to northern North America. In the contiguous 48 states, native glacial-relic, populations of grayling were once found in both Montana and Michigan. The Michigan populations went extinct due to habitat degradation and over fishing. In Montana, both life forms of Arctic grayling exist, lake dwelling (lacustrine or adfluvial) and river dwelling (fluvial). Currently, adfluvial Arctic grayling are common in lakes across the western half of Montana. Historically, fluvial Arctic graying were widespread throughout the Missouri River drainage upstream of Great Falls. They now are reduced to a single, native population in the Big Hole River, in southwest Montana.
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Very migratory during spawning and early life stages; up to 60 mile seasonal movements between habitats in Big Hole. Utilizes various habitats in multiple places over their life history.
Today in Montana Arctic Grayling are found primarily small, cold, clear lakes with tributaries suitable for spawning. They do not coexist well with other fishes except cutthroat trout and others with which they evolved.
Arctic grayling feed mainly on aquatic insects, but eat what is available to them. River populations are mostly insectivores, while zooplankton are important food sources in lake populations.
Although fluvial Arctic Grayling inhabit the entire Big Hole River, highest densities occur in the vicinity of Wisdom. The majority of spawning occurs near Wisdom in the main stem and several tributaries (Liknes and Gould 1987, Shepard and Oswald 1989, Byorth 1994). Fluvial Arctic Grayling are reared in the vicinity of where they hatch; thus, the Wisdom area provides the majority of rearing habitat as well (Montana AFS Species Status Account
Arctic Grayling rarely live beyond 5 years in the Big Hole River. Fast growth rates and short life spans result in domination of spawning by fish aged 3 and 4 years. Thus, poor recruitment in a given year may substantially affect recruitment to the population for several years (Montana AFS Species Status Account
Arctic Grayling grow quickly in the Big Hole River, reaching full sexual maturity and nearly maximal size by age 3 (Montana AFS Species Status Account
On 20 August 2014, the U.S. Fish and Wildlife Service published a notice in the Federal Register indicating that, "after review of the best available scientific and commercial information, we find that listing the Upper Missouri River DPS of Arctic Grayling is not warranted at this time. The best available scientific and
commercial information indicates that habitat-related threats previously identified, including habitat fragmentation, dewatering, thermal stress, entrainment, riparian habitat loss, and effects from climate change, for the Upper Missouri River DPS of Arctic Grayling have been sufficiently ameliorated and that 19 of 20 populations of Arctic Grayling are either stable or increasing. This action removes the Upper Missouri River DPS of the Arctic Grayling from our candidate list". Additional information on the species' management can be found on the U.S. Fish and Wildlife Service's Species Account
Threats or Limiting Factors
Factors potentially threatening persistence of fluvial Arctic grayling in the Big Hole River include water quality and quantity, competition with introduced species, predation, habitat degradation, and negative effects of angling. Water quantity issues include drought, irrigation withdrawals, and recruitment limitation due to sudden runoff events.
- Literature Cited AboveLegend: View Online Publication
- Byorth, P. A. 1994. Big Hole River Arctic grayling recovery project: annual monitoring report 1993. Submitted to: Fluvial Arctic Grayling Workgroup. Montana Department of Fish, Wildlife, and Parks, Bozeman.
- Liknes, G. A. and W. R. Gould. 1987. The distribution, habitat and population characteristics of fluvial Arctic grayling (Thymallus arcticus) in Montana. Northwest Science 61:122-129.
- Shepard, B.B., and R.A. Oswald. 1989. Timing, location and population characteristics of spawning Montana Arctic Grayling (Thymallus arcticus montanus (Milner)) in the Big Hole River drainage, 1988. Bozeman, Mont: Montana Dept. of Fish, Wildlife and Parks.
- Additional ReferencesLegend: View Online Publication
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- Armstrong, R.H., et al. 1986. A review of Arctic grayling studies in Alaska, 1952-1982, with an indexed bibliography of the holarctic genus Thymallus (grayling) to 1985. Biol. Papers of the University of Alaska, No.23 (ISSN 0568-8604).
- Bishop, F. G. 1971. Observations on spawning habits and fecundity of the Arctic grayling. Progressive Fish-Cuiturist 33:12-19.
- Brown, C. J. D. 1938. Observations on the life-history and breeding habits of the Montana grayling. Copeia 3:132-136.
- Craig, P. C, and V. A. Poulin. 1975. Movements and growth of Arctic grayling ( Thymailus arcticus ) and juvenile Arctic char ( Salvelinus alpinus ) in a small arctic stream, Alaska. Journal of the Fisheries Research Board of Canada 32:689-698.
- Curtis, M. 1977. The age, growth and management of the Arctic grayling ( Thymailus arcticus ) in Wyoming. M.S. Thesis, University of Wyoming, Laramie, Wyoming.
- deBruyn, M., ana P. McCart. 1974. Life iiistory of the grayling ( Thymallus arcticus) in Beaufort Sea drainages in the Yukon Territory. Pages 92-130 in Arctic Gas Biological Report Series, Volume 20, Aquatic Environments Limited, Calgary, Alberta.
- Eriksen, C. H. 1975. Physiological ecology and management of the r&rs "southern" grayling Thymallus arcticus tricolor Cope. Verh. Internat. Verein . Limnol . 19:2448-2455.
- Henshall, J. A. 1907. Culture of the Montana grayling. U.S. Bureau of Fisheries, Document 628, Washington, D.C.
- Kaya, CM. 1989. Innate differences in behavioral responses to water current of Arctic grayling from fluvial and lacustrine populations in Montana. 119th Annual Meeting of the American Fisheries Society, Anchorage (abstract)
- Kratt, L. F., and R. J, F. Bmith. 1977. A post-hiatching subgravel stage in the life history of the Arctic grayling, Thymallus arcticus . Transactions of the American Fisheries Society 106:241-243.
- Krueger, S. W. 1981. Freshwater habitat relationships, Arctic grayling, Thymallus arcticus . Unpublished Report, Alaska Department of Fisn and Game, Habitat Division, Juneau, Alaska
- Kruse, T. E. 1959. Grayling of Grebe Lake, Yellowstone National Park, Wyoming. Fishery Bulletin 149, Volume 59, U.S. Fish and Wildlife Service, Washington, D.C.
- LaPerriere, J.D. and R.F. Carlson. 1973. Thermal tolerances of interior Alaskan arctic grayling, Thymallus arcticus . Inst. Water Resour. Rep. IWR-4 6. Univ. Alaska, Fairbanks.
- Liknes, G.A. 1981. The fluvial arctic grayling (Thymallus arcticus) of the upper Big Hole drainage, MT. M.S. thesis. Montana State University, Bozeman 59 pp.
- Magee, James P., 2000, Montana fluvial arctic grayling recovery project : annual monitoring report
- Montana Chapter of the American Fisheries Society species status accounts.
- Nelson, P.H. 1953. Life history and management of the American Grayling (Thymallus signifer tricolor) in Montana. M.Sc. thesis, Montana State College, Bozeman. 45 pp.
- Nelson, P.H. 1954. Life history and management of the American Grayling (Thymallus signifer tricolor) in Montana. Journal of Wildlife Management 18(3):324-342.
- Peterman, L. G. 1972. The biology and population characteristics of the Arctic grayling in Lake Agnes, Montana. M.S. Thesis, Montana State University, Bozeman Montana.
- Rawson, D. S. 1950. The grayling ( Thymallus sianifer ) in northern Saskatchewan. Canadian Fish Culturist 6:3-10.
- Roy F. Weston, Inc., Bozeman, MT., and Western Technology and Engineering, Inc., Helena, MT., 1989, Stillwater PGM Resources East Boulder Project Addendum F: Supplemental Biological Studies. Final Report. December 1989.
- Skaar, D. 1989. Distribution, relative abundance and habitat utilization of the arctic grayling (Thymallus arcticus) in the upper Big Hole River drainage, Montana, July 5 to September 8, 1988. Montana Natural Heritage Program 55 pp.
- Stuart K. M, and G. R. Chislett. 1979. Aspects of the life history cf Arctic grayling in the Sukunka drainage. Final Report, British Columbia Fish and Wildlife Branch, Prince George, British Columbia.
- Tack, S. L. 1971. Distribution, abundance, and natural history of the Arctic grayling in the Tanana River drainage. Alaska Department of Fish and Game, Federal Aid in Fish Restoration, Annual Report of Progress, 1970-1971. Project F-9-3, 12(R-I), Juneau, Alaska.
- Tack, S. L. 1973. Distribution, abupdance, and natural history of the Arctic grayling in the Tanana River drainage. Alaska Department of Fish and Game, Federal Aid in Fish Restoration, Annual Report of Progress, 1972-1973. Project F-9-5, 14(R-I), Juneau, Alaska.
- Tack, S. L. 1974. Distribution, abundance, and natural history of the Arctic grayling in the Tanana River drainage. Alaska Department or Fish and Game, Federal Aid in Fish Restoration, Annual Performance Report, 1973-1974. Project F-9-6, 15(R-I), Juneau, Alaska.
- Tack, S. L. 1980. Migrations and distribution of Arctic grayling, Thymallus arcticus (Pallas), in interior and arctic Alaska. Alaska Department of Fish and Game, Federal Aid in Fish Restoration, Annual Performance Report, 1979- 1980. Project F-9-12, 21(R-I), Juneau, Alaska.
- Tripp, D.B., and P.J. McCart. 1974. Life histories of grayling ( Tnymallus arcticus ) and longnose suckers ( Catostomus catostomus ) in the Donnelly River System, Northwest Territories. Pages 1-91 iji Arctic Gas Biological Report Series, Volume 20, Aquatic Environments Limited, Calgary, Alberta.
- Tryon , C. A. Jr. 1947. The Montana grayling. Progressive Fish-Culturist 9:136-142.
- Vincent, R. E. 1962. Eiogeographical and ecological factors contributing to the decline of Arctic grayling, Thymallis arcticus (Pallas), in Michigan and Montana. Ph.D. Dissertation, University of Michigan, Ann Arbor, Michigan.
- Ward, J. C. 1951. The biology of the Arctic grayling in the southern Athabasca draxnage. M.A. Thesis, University of Alberta, Edmonton, Alberta, Canada.
- Warner, G. W. 1955. Spawning habits of grayling in interior Alaska. U.S. Fish and Wildlife Service and Alaska Game Commission, Federal Aid in Fish Restoration, Quarterly Progress Report. Project F-l-R-5, Work Plan E, Job Number 1, 5(2), Juneau, Alaska.
- Warner, G. W. 1957. Movements and migrations of grayling in interior Alaska. U.S. Fish and Wildlife Service and Alaska Game Commission, Federal Aid in Fish Restoration, Quarterly Progress Repor t. Project F-l-R-6, Work Plan C, Job Number 3, 6(4), Juneau, Alaska.
- Williams, F. T. 1968. Grayling investigations on Tolsona and Moose Lakes. Alaska Department of Fish and Game, Federal Aid m Fish Restoration, Annual Report of Progress, 1967-1963. Project F-5-R-9, 9(14-B) : 257-264 , Juneau, Alaska.
- Wojcik, F. J. 1954. Spawning hiabits of grayling in interior Alaska. U.S. Fish and Wildlife Service and Alaska Game Commission, Federal Aid in Fish Restoration, Quarterly Progress Report. Project F-l-R-3, Work Plan 1, 3(3), Juneau, Alaska.
- Wojcik, F. J. 1955. Life history and management of the grayling in interior Alaska. M.S. Thesis, University of Alaska, Fairbanks, Alaska.
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