![]() ![]() ![]() Above 27 degrees they usually become moribund. Halfyard says that salmon “really struggle when water is warmer than about 20 or 23 degrees, although juveniles can do quite well at 25 or 26 degrees. Clearcutting, for example, speeds up runoff into rivers when there is heavy rain, making riverbeds wider and shallower, and thus too warm for fish. They want to restore the natural meandering path of the rivers, which historically were straightened by bulldozers for better log passage, or blocked by dams, and also, Halfyard says, affected by land use around them. Jillian Leonard and Edmund Halfyard at Killag doser site.
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