Samples of the dead salmon and trout fry discovered by swimmers below Skutz Falls in late July showed lesions associated with stressful environmental conditions
A prolonged drought and sustained heat were behind a mass die-off of fish this summer in the Cowichan River, says a new report from the Department of Fisheries and Oceans.
There were no estimates on the number of fish that may have died during heat waves that started in May. “It’s unprecedented,” said Tom Rutherford, executive director of the Cowichan Watershed Board, which is led by Cowichan Tribes and local governments in the watershed . With water flows so low — down to about 4.5 cubic metres per second — the fish tend to migrate to pools where the water temperature heats up, oxygen levels drop and algae blooms form, said Rutherford.
An operation to pump water out of Cowichan Lake was announced this week by Paper Excellence, which runs the pulp mill at Crofton and the weir that regulates flows from the lake into the river system.
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