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| Ruffe |
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| Name and Code |
| Family |
| Percidae - perches and darters |
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| Species |
| Gymnocephalus cernua |
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| Taxonomic Authority |
| (Linnaeus 1758) |
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| Conservation Status |
| Global Rank (GRank) |
| G5 (1996-09-25) |
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| National Rank (NRank) |
| NNA (2017-12-22) |
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| Provincial Rank (SRank) |
| SNA (1997-10-02) |
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| Ecological Value |
| Ontario Origin |
| introduced |
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| General Abundance |
| limited distribution |
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| Economic Importance |
| invasive species |
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| Length-Weight Regression Coefficents |
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| Habitat and Feeding |
| General Habitat(s) |
| lacustrine; riverine |
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| Environment |
| benthopelagic |
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| Trophic Class |
| invertivore |
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| Habitat Preference |
| lakes and lowland rivers; prefers still or slow-flowing waters over soft bottom, without vegetation |
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| Reproduction |
| Reproductive Guild |
| Nonguarders: Open substratum spawners: Phyto-lithophils |
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| Spawning Habitat(s) |
| lacustrine; riverine |
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| Spawning Month(s) |
| April-June |
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| Spawning Temperature (°C) |
| 6-18 |
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| Nursery Habitat(s) |
| lacustrine; riverine |
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| Size and Age |
| Adult Length (cm) |
| 11.4-20.3 TL |
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| Adult Weight (kg) |
| 0.018-0.095 |
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| Age at Maturity (yrs) |
| 1-3 (m); 2-4 (f) |
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| Maximum Length (cm) |
| 29 TL |
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| Lifespan (yrs) |
| 3-7 (m); 7-11 (f) |
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| Ontario Records |
| Record Length (cm) |
| 21.2 TL |
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| Ontario Range Map |
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Ontario Distribution |
| Lake Superior (Thunder Bay), Kaministiquia River; introduced with ballast water into Lake Superior in 1985; first reported from Ontario waters in 1991 |
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| Photographs |
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| Notes |
| native to Europe and Asia; moderately intolerant of turbidity; use as bait prohibited |
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| Information Sources |
| Bailey, R.M., W.C. Latta, and G.R. Smith. 2004. An atlas of Michigan fishes with keys and illustrations for their identification. University of Michigan Museum of Zoology Miscellaneous Publications No. 192. iv + 215 pp. |
| Barbour, M.T., J. Gerritsen, B.D. Snyder, and J.B. Stribling. 1999. Tolerance and trophic guilds of selected fish species. Appendix C in Rapid bioassessment protocols for use in streams and wadeable rivers: periphyton, benthic macroinvertebrates and fish, second edition. EPA 841-B-99-002. U.S. Environmental Protection Agency; Office of Water. Washington, DC. |
| Bernatchez, L. and M. Giroux. 2000. Les poissons d’eau douce du Québec et leur répartition dans l’Est du Canada. Broquet Inc. Saint-Constant, QC. 350 pp.
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| Coad, B.W. with H. Waszczuk and I. Labignan. 1995. Encyclopedia of Canadian fishes. Museum of Nature and Canadian Sportfishing Productions. Ottawa and Waterdown, ON. viii + 928 pp. |
| Coker, G.A., C.B. Portt, and C.K. Minns. 2001. Morphological and ecological characteristics of Canadian freshwater fishes. Can. MS Rpt. Fish. Aquat. Sci. 2554: iv + 89 p. |
| Cudmore, B. and N.E. Mandrak. 2018. The baitfish primer: a guide to identifying and protecting Ontario's baitfishes. Fisheries and Oceans Canada, Bait Association of Ontario, Ontario Ministry of Natural Resources and Forestry, Ontario Federation of Anglers and Hunters. March 2018. 40 pp. |
| Cudmore-Vokey, B. and E.J. Crossman. 2000. Checklists of the fish fauna of the Laurentian Great Lakes and their connecting channels. Can. MS Rpt. Fish. Aquat. Sci. 2550: v + 39 p. |
| Desroches, J-F. and I. Picard. 2013. Poissons d’eau douce du Québec et des Maritimes. Éditions Michel Quintin. Waterloo, QC. 471 pp. |
| Ditz, K. and E. Holm. 2023. Ontario Fish Species Codes and Names. Ichthyology and Herpetology, Royal Ontario Museum. May 1994. Modified February 2023. |
| Holm, E., N. Mandrak, and M. Burridge. 2021. A field guide to freshwater fishes of Ontario, second edition. Royal Ontario Museum Science Publication. Toronto, ON. 486 pp. |
| Hubbs, C.L., K.F. Lagler, and G.R. Smith. 2004. Fishes of the Great Lakes region, revised edition. University of Michigan Press. Ann Arbor, MI. xvii + 276 pp. |
| Integrated Taxonomic Information System (ITIS). 2023. On-line database. http://www.itis.gov, retrieved 02 May 2023. |
| Kottelat, M. and J. Freyhof. 2007. Handbook of European freshwater fishes. Cornol, Switzerland. xiii + 646 p. |
| Lane, P.A., C.B. Portt, and C.K. Minns. 1996. Nursery habitat characteristics of Great Lakes fishes. Can. MS Rpt. Fish. Aquat. Sci. 2338: v + 42 p. |
| Lane, P.A., C.B. Portt, and C.K. Minns. 1996. Adult habitat characteristics of Great Lakes fishes. Can. MS Rpt. Fish. Aquat. Sci. 2358: v + 43 p. |
| Lane, P.A., C.B. Portt, and C.K. Minns. 1996. Spawning habitat characteristics of Great Lakes fishes. Can. MS Rpt. Fish. Aquat. Sci. 2368: v + 48 p. |
| Lui, K., M. Butler, M. Allen, E. Snyder, J. da Silva, B. Brownson and A. Ecclestone. 2010. Field guide to aquatic invasive species (3rd Edition): identification, collection and reporting of aquatic invasive species in Ontario waters. Ontario Ministry of Natural Resources. |
| Mandrak, N.E. and E.J. Crossman. 1992. A checklist of Ontario freshwater fishes annotated with distribution maps. Royal Ontario Museum Life Sciences Miscellaneous Publication. Toronto, ON. v + 176 pp. |
| NatureServe. 2023. NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer [web application]. NatureServe, Arlington, Virginia. Available https://explorer.natureserve.org/ (Accessed: February 2, 2023). |
| Page, L.M. and B.M. Burr. 2011. Peterson field guide to freshwater fishes of North America north of Mexico, second edition. Houghton Mifflin Harcourt. Boston, MA. xix + 663 pp. |
| Page, L.M., K.E. Bemis, T.E. Dowling, H.S. Espinosa-Pérez, L.T. Findley, C.R. Gilbert, K.E. Hartel, R.N. Lea, N.E. Mandrak, M.A. Neighbors, J.J. Schmitter-Soto, and H.J. Walker Jr. 2023. Common and scientific names of fishes from the United States, Canada, and Mexico. 8th Edition. American Fisheries Society, Spec. Publ. 37. Bethesda, MD. 439 pp. |
| Portt, C.B., G. Coker, and C.K. Minns. 1999. Riverine Habitat Characteristics of Fishes of the Great Lakes Watershed. Can. MS Rpt. Fish. Aquat. Sci. 2481: vi + 62 p. |
| Scott, W.B. and E.J. Crossman. 1973. Freshwater fishes of Canada. Bull. Fish. Res. Board Can. 184. [1998 Reprint] Galt House Publications Ltd. Oakville, ON. xx + 966 pp. |
| Scharpf, C. 2008. Annotated checklist of North American freshwater fishes, including subspecies and undescribed forms. Part IV: Cottidae through Percidae. American Currents 34(4):1-43. |
| Trebitz, A.S., J.C. Brazner, V.J. Brady, R. Axler, and D.K. Tanner. 2007. Turbidity tolerances of Great Lakes coastal wetland fishes. N. Amer. J. Fish. Man. 27:619-633. |
| Winterton, G. [Ed]. 2005. The comprehensive bait guide for eastern Canada, the Great Lakes region and northeastern United States: identifying, harvesting and culture of baitfishes, crayfishes, frogs and leeches. University of Toronto Press. Toronto, ON. iv + 437 pp. |
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