This is an interesting articles that should prompt discussion from Bow River anglers. Since Calgary's Bonnybrook Waste Water Treatment Plant has been upgraded we have seen increases in stoneflies in the river. Two species in particular are now important food source for trout, the July Nocturnal Yellow Stone fly and an increasing presence of Skwala Stone fly in May.
At the same time we are seeing a substantial decrease in caddis and the historically important Pale Morning Dun hatch.
Although it is unlikely that water and waste-water management can be changed to increase invertebrate population to enhance trout feed, there is a place for a better understanding of the Bow River bug life.
Mayflies and stone flies are extremely vulnerable to water pollution, which has implications for the larger food chain.
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Stoneflies and mayflies, canaries of our streams
Mayflies and stone flies are extremely vulnerable to water pollution, which has implications for the larger food chain.