Calgary hopes to freeze invasive fish species out of city ponds
But the burrowing brings another springtime problem, disrupting the next generation of fish indigenous in the area.
“That burrowing – as well as rooting around for food – destroys juvenile habitat, so rearing habitat for young fish,” Sylvia D’Amelio, fisheries biologist and CEO for Trout Unlimited Canada, told Global News. “We do know clearly that invasive species can spread disease and infection — that’s been demonstrated in a lot of water bodies. We know that a lot of these species compete for resources,” she said, noting Prussian carp are a hardy species that breeds multiple times a year, in contrast to native species that only have annual spawning periods.
“We see this happening across the country where either animals are released into water bodies — that are released into stormwater management ponds — and then eventually work their way into natural water bodies and impact native fish and sport fisheries.”Calgary’s stormwater system – separate from the wastewater system – drains into the Bow River. And a period of heavy rain could flush the fish into the city’s largest river.
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