Chestnut Lamprey

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Species at Risk Profile Series: Chestnut Lamprey • Chestnut Lampreys are considered Special Concern in Canada. • They are a parasitic fish found in freshwater lakes and rivers. • Lamprey do not possess jaws, but instead have a circular set of teeth on a suction-cup mouth used for rasping off the scales of their host so the lamprey can feed on their blood. • Their first 5-7 years of life are spent as filter-feeding larvae buried in stream bottoms, eat- ing algae and other microscopic organisms. • Lampreys then metamorphize into their adult form, exchanging their filter mouth for their suction-cup mouth. • Chestnut Lampreys live as adults for 18 months before spawning and subsequently dying. • Their estimated home range is approximately 50 km. • Chestnut Lampreys appear to primarily feed at night, presumably to avoid predation. • During spawning, they use their suction-cup mouths to move rocks and create a nest. • Spawning occurs in streams during late summer. Conservation • Population sizes are not well understood due to limited sampling. • Chestnut Lampreys are considered to compose two populations in Canada, one in the Great Lakes-Upper St. Lawrence River and one in Saskatchewan-Nelson River. • Chestnut Lampreys are Saskatchewan’s only lamprey, and are the most common of Manitoba’s three lamprey species. Get involved • Read the assessment and status report for Chestnut Lamprey here. Photo credit: Chestnut Lamprey by Philip Rogers retrieved from https://www.flickr.com/photos/ usfwsmidwest/15278185021 licensed under CC-BY 2.0 https://creativecommons.org/licenses/by/2.0/ (front) Range map credit: COSEWIC. 2010. COSEWIC assessment and status report on the Chestnut Lamprey Ich- thyomyzon castaneus (Great Lakes—Upper St. Lawrence populations and Saskatchewan—Nelson River populations) in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. xii + 35 pp. Chestnut Lamprey January 2017 .

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