. The Canadian field-naturalist. Four Records of the Chestnut Lamprey, Ichthyomyzon castaneus. New to Ontario Claude B. Renaud', Sandra C. Ribey^ and Francois Chapleau^ 'Research Division, Canadian Museum of Nature, Box 3443, Station D, Ottawa, Ontario KIP 6P4 â ^Ottawa-Carleton Institute of Biology, Department of Biology, University of Ottawa, Box 450, Station A, Ottawa, Ontario KIN 6N5 Renaud, Claude B., Sandra C. Ribey, and Francois Chapleau. 1996. Four records of the Chestnut Lamprey, Ichthyomyzon castaneus, new to Ontario. Canadian Field-Naturalist 110(3): 450^53. We report on t
. The Canadian field-naturalist. Four Records of the Chestnut Lamprey, Ichthyomyzon castaneus. New to Ontario Claude B. Renaud', Sandra C. Ribey^ and Francois Chapleau^ 'Research Division, Canadian Museum of Nature, Box 3443, Station D, Ottawa, Ontario KIP 6P4 â ^Ottawa-Carleton Institute of Biology, Department of Biology, University of Ottawa, Box 450, Station A, Ottawa, Ontario KIN 6N5 Renaud, Claude B., Sandra C. Ribey, and Francois Chapleau. 1996. Four records of the Chestnut Lamprey, Ichthyomyzon castaneus, new to Ontario. Canadian Field-Naturalist 110(3): 450^53. We report on the widespread, although rare, presence of the parasitic Chestnut Lamprey (Ichthyomyzon castaneus) in Ontario based on four collections and five specimens. This report increases the number of lamprey species for the province to five, three of which are parasitic. The Chestnut Lamprey is sympatric with three of the four other Ontario lamprey species. Key Words: Chestnut Lamprey, Ichthyomyzon castaneus, Ontario, Petromyzontidae. We report on the widespread although rare occurrence of the parasitic Chestnut lamprey, Ichthyomyzon castaneus Girard, 1858, in Ontario (Figures 1 and 2). During the course of routine cura- torial work, three collections of lampreys in The Canadian Museum of Nature (CMN) were found to contain four transformed specimens of this species. A fourth collection of a single immature transformed specimen ( mm TL) was made on the 3 August 1994 in the St. Lawrence River off the northeast side of eastern Colquhoun Island (45°01'N 74°38'W) near Cornwall, Glengarry County, and has since been deposited in the Canadian Museum of Nature (CMN) [formerly National Museum of Canada, NMC] (alphanumeric catalogue code NMC95-7). The specimen was collected in a trapnet by one of us (SCR) in swift, very clear water over a rocky and weedy substrate. The first collection (NMC 86-856) was made on the 18 May (year unrecorded) in the Mad River (44°24'N 79°54'W), Simco
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