. Die kanadische Feld - naturforscher. 1980 Notizen 181. Abbildung 1. Position, an der ersten Runde Felchen in Alberta wurden erfasst und durch entsprechende Strukturen in der Folge in das Delta (Kristensen et al. gebaut 1976; Kristensen^; Kristensen und Sommer 1978). Angeln mit variabler Mesh gill-net Banden wurde für ca. 550 Mann durchgeführt - Tagen und ca. 36 000 Fische (Art Com kombiniert) wurden während der 3-jährigen Periode erfasst. Am 29. Mai 1977 Wir zwei Runde Felchen an wenig Rapids erfasst auf der Riviere des Rochers entlang der östlichen Grenze der Wood Buffalo National Park (Abbildung 1). Beide Fische w

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. The Canadian field-naturalist. 1980 Notes 181. Figure 1. Location where first Round Whitefish in Alberta were captured. and by remedial structures subsequently built in the Delta (Kristensen et al. 1976; Kristensen^; Kristensen and Summers 1978). Fishing with variable-mesh gill- net gangs was conducted for approximately 550 man- days and approximately 36 000 fishes (species com- bined) were captured during the 3-yr period. On 29 May 1977 we captured two Round Whitefish at Little Rapids on the Riviere des Rochers along the eastern boundary of Wood Buffalo National Park (Figure 1). Both fish were captured in a 6.4-cm monofilament nylon gill net set in approximately 5 m of water. The river is approximately 275 m wide at Little Rapids and on 29 May 1977 the water was at 13°C, extremely turbid, and flowing rapidly toward the Peace River. One of the Round Whitefish was tagged and released; the other was preserved and deposited at the Department of Zoology Museum, University of Al- berta (collection number UAMZ 3779). Immediately ^Kristensen, J. 1978. Investigations ofGoldeye and other fish species in the Wood Buffalo National Park section of the Peace-Athabasca Delta, 1977. Report prepared for Fisheries Subcommittee, Peace-Athabasca Delta Monitoring Com- mittee by LGL Limited. 108 pp. following capture the former weighed 340 g and was 324 mm in fork length and 356 mm in total length; the preserved fish, a mature female, weighed 312 g and was 336 mm in fork length and 361 mm in total length. On the basis of scale readings, the preserved fish was 8 yr old. Both fish were captured immediately downstream (northwest) of a submerged weir constructed across the Riviere des Rochers. At this time, large numbers of fishes of other species, primarily Goldeye {Hiodon alosoides), were concentrated downstream of the weir. High water velocities (2.1 m/s) across the weir probably hindered fishes, including the Round Whitefish, from moving upstream. These data suggest that the two Roun

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