Fraser River Discharge at Hope
Critical Levels for Fish Passage through Fraser Canyon:
7000 cms - Early signs of physiological stress evident
8000 cms - Difficultly in migration delaying migration time.
9000 cms - Barrier to migration through Hell's Gate.
Fraser River Water Temperatures at Hope
18°C - Decreased swimming performance
19°C - Early signs of physiological stress and slow migration
20°C - Associated with high pre-spawn mortality and disease
21°C - Chronic exposure can lead to severe stress and early mortality.