Warm weather and low water flows mean that many rivers and streams in Alberta - particularly southern Alberta - are much warmer than usual, putting stress on fish. As this Calgary Herald article outlines, the Alberta Government has imposed fishing closures on several rivers and watersheds in the southern parts of the province in an effort to reduce the stress on fish populations. Even so, several species - including some that are listed as 'at-risk' - are still in danger because of the high water temperatures.
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