Abstract
system in British Columbia and Alberta. The closely related R. egregius occurs further south in the Lahonton Basin of Nevada, western Utah, southern Idaho, and northeastern California. The principle difference between the two species is that R. egregius has 8-9 anal rays whereas R. balteatus has 10-22. The redside shiner has received considerable attention since the time of Eigenmann (1895) because of the remarkable range in the number of its anal fin rays. Different populations of this species have significantly different means of ray count and fluctuations appear within certain populations. Attempts have been made to correlate these differences
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