. The Canadian field-naturalist. Natural history. 2001 Holm and Crossman: Updated Status of the Central Stoneroller 161 F5^. 150 Kilometers Figure 3. Canadian distribution of the Central Stoneroller, 1972 to 1996. Open circles represent records according to McAllister (1987). Solid squares represent records discovered since McAllister (1987). The question mark repre- sents The Kaladar area collections. McKee and Parker (1982) reported that it was fre- quently the most common fish in much of the upper Thames drainage. They gave density estimates for Ontario ( fish nr2, n = 3) that are
. The Canadian field-naturalist. Natural history. 2001 Holm and Crossman: Updated Status of the Central Stoneroller 161 F5^. 150 Kilometers Figure 3. Canadian distribution of the Central Stoneroller, 1972 to 1996. Open circles represent records according to McAllister (1987). Solid squares represent records discovered since McAllister (1987). The question mark repre- sents The Kaladar area collections. McKee and Parker (1982) reported that it was fre- quently the most common fish in much of the upper Thames drainage. They gave density estimates for Ontario ( fish nr2, n = 3) that are similar to those given by Mundahl and Ingersoll (1989) for Ohio ( fish nr2) and other parts of the United States ( fish nr2). No population esti- mates have been conducted on Canadian popula- tions. Based on relative abundance to other species in catches, the Central Stoneroller is moderately abundant in several of the streams outside the Thames drainage. It comprised to (x= , n=7) of the number of specimens in collections made in the Rouge River system and represented to (x = , n = 3) of the catch at the three col- lections made in 1996 in Essex County streams. A 1993 electro fishing survey of upper Thames streams in Oxford County captured a total of 32 Central Stonerollers at 7 of 59 sites sampled (ROM Accessions 6087, 6090, and 6107). The species was abundant at one site where it represented 55% of 22 specimens captured and moderately abundant at two sites where it comprised 3 of 15 and 8 of 52 specimens. A 1996 survey of creeks by the Grand River Con- servation Authority discovered a well-established population of Central Stonerollers in the upper Grand River drainage near Grand Valley and Luther Lake. It was found at 14 of 30 sites sampled. A total of 215 Campostoma anomalum were captured which represented of all specimens collected. At three sites there were more stonerollers caught than any other species and at another thre
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