. The Big Blackfoot River restoration progress report for 2002 and 2003 . Fish populations; Fishes; Fishery management; Trout fisheries; Stream ecology; Blackfoot River (Mont. ). Com m on Na me Su sceptibility Rainbow Trout 3 Westslope Cutthroat 2 Brook Trout 2 Bull Trout 1 Brown Trout 1 Mountain Wtiitefish 2S Table 16. Susceptibility to whirling disease among species of salmonids in the Blackfoot River. Scale of 0 to 3 or S: 0 = resistant; 1= partial resistance; 2 = susceptible; 3 = highly susceptible; S = susceptibility is unclear (conflicting reports), (adapted from MacConnell and Vincent 2
. The Big Blackfoot River restoration progress report for 2002 and 2003 . Fish populations; Fishes; Fishery management; Trout fisheries; Stream ecology; Blackfoot River (Mont. ). Com m on Na me Su sceptibility Rainbow Trout 3 Westslope Cutthroat 2 Brook Trout 2 Bull Trout 1 Brown Trout 1 Mountain Wtiitefish 2S Table 16. Susceptibility to whirling disease among species of salmonids in the Blackfoot River. Scale of 0 to 3 or S: 0 = resistant; 1= partial resistance; 2 = susceptible; 3 = highly susceptible; S = susceptibility is unclear (conflicting reports), (adapted from MacConnell and Vincent 2002). tributaries at several sites. For example lower Cottonwood Creek, highly infected since 1998, shows a large decline in rainbow trout (mile ) compared with the 1989 pre- whirling disease period, whereas brown trout densities have dramatically increased (Figure 57). A similar pattern was also observed with YOY in this same section in Cottonwood Creek. Likewise, brook trout, a species susceptible to the disease, have declined in one section of Kleinschmidt in the presence of high infection (Figure 58). Blackfoot River native WSCT and bull trout appear to have a diminished risk of contracting whirling disease due in part to habitat use and life history strategies that entail spawning and rearing in tributaries, above the general elevation of the disease. Whirling disease severity typically increases in the downstream direction in Blackfoot River tributaries. This inverse relationship between elevation and infection has been detected in previous studies (Hiner and Moffitt 2001; Sandell 2001; Smith 2001; Hubert 2002; Anderson 2004), and may be a result of the parasite's lack of time in the area, low numbers of myxospores in the environment, or a lack of suitable habitat supporting T. tubifex. In Cottonwood Creek, Smith (1998) reported higher gradient, higher elevation habitats typically support lower T. tubifex densities and thus fewer TAMs. Sentinel cage studies confirm thi
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