. The Canadian field-naturalist. Figure 1. Ichthyomyzon fossoi. Icmale, 13(J mm TL: Birch River, upstream of Prawda, Manitoba; May 13, 1977; J. Jyrkkanen; ROM 34264. Note blunt, degenerate and unicuspid disc teeth. Michigan, Ohio and Pennsylvania (not present in Lake Ontario), in the Ohio basin of Illinois, Indiana, Ohio and Kentucky and in the Lower Missouri basin of Missouri where a disjunct population is found in the Ozark Uplands (Figure 3) [Pflieger 1971]. In Canada (Figure 4), the Northern Brook Lamprey occurs in the Great Lakes basin from Lake Superior to Lake Erie but appears to be abs
. The Canadian field-naturalist. Figure 1. Ichthyomyzon fossoi. Icmale, 13(J mm TL: Birch River, upstream of Prawda, Manitoba; May 13, 1977; J. Jyrkkanen; ROM 34264. Note blunt, degenerate and unicuspid disc teeth. Michigan, Ohio and Pennsylvania (not present in Lake Ontario), in the Ohio basin of Illinois, Indiana, Ohio and Kentucky and in the Lower Missouri basin of Missouri where a disjunct population is found in the Ozark Uplands (Figure 3) [Pflieger 1971]. In Canada (Figure 4), the Northern Brook Lamprey occurs in the Great Lakes basin from Lake Superior to Lake Erie but appears to be absent in the Lake Ontario drainage (Scott and Grossman 1973) even though one transformed individual was cap- tured in Tosorontio Greek (49°09'N, 79°58'W) in 1974 (ROM 30543). It has been captured in the Ottawa River at Ottawa (45°28'N, 75°37'W) [Canadian Museum of Nature (NMG) 82-0319] and it occurs in the St. Lawrence River down to the Nicolet River (Vladykov 1952). Its range in Canada has recently been extended further west to the Nelson River drainage of Manitoba (Jyrkkanen and Wright 1979) where it has been captured in the Whitemouth River (50°00'N, 96°00'W) and one of its tributaries, the Birch River (49°39'N, 95°47'W). This distribution represents the northern limits of the range of the Northern Brook Lamprey in North America. Protection The Northern Brook Lamprey is not listed as endangered, threatened or of concern in North America (Williams et al. 1989). In Canada, the species is not the object of any specific legal protec- tion other than the general protection granted under habitat and pollution prevention sections of the Federal Fisheries Act. In Manitoba protection can be afforded through the provincial Endangered Species Act by regulation. Population Sizes and Trends No population estimates are available. In the St. Lawrence drainage of Ouebec, Vladykov (1952) captured 63 adults and 849 ammocoetes between September 1946 and August 1951. The range exten- sion
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