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La Mauricie National Park

Two employees of the Resource Conservation Service retrieve logs along the shoreline.
The aquatic team retrieves sunken logs close to the shoreline. © Parks Canada

Improvement of Aquatic Ecosystems

The aquatic team performs work to improve aquatic environments and is concerned with controlling fishing quotas.

Why work to improve aquatic environments?

At several places, water levels are too high because of dams that are now no longer being used. Thousands of logs currently lie at the bottom of many lakes. Populations of speckled trout (brook trout) fell almost by half, and most of the lakes it inhabits also contain exotic invasive species of fish that are detrimental to its well-being.

On the aquatic team’s agenda

Since 2004, 14 lake outlets have been cleared and their dams have been removed, 26,500 logs have been retrieved, 28.5 kilometres of shoreline and 2.5 kilometres of watercourses have been cleaned, and 5 populations of speckled trout have been rebuilt. All this work has helped to re-establish the natural dynamics of shores and wetlands and to give certain speckled trout populations a chance of perpetuating themselves and evolving naturally. Despite all the progress accomplished to date, the team still has its work cut out for itself in the coming years! Eleven lakes and two streams are still on the list!

Did you know that it removed 7,500 logs from Reid Lake and 1,500 from Daire Lake, two of the Park’s lakes targeted for restoration?

Did you know that since 2011, 850 speckled trout captured in Houle and Avalon Lakes have been living in Reid Lake, from which this species had disappeared prior to the establishment of the park? As of spring 2012, trout fry have already been observed in the lake. The team found two locations that appear to be used as spawning grounds. In what is a bit of good news, Daire and Suré Lakes, both located downstream, should also be naturally colonized by speckled trout, now that the restoration team has dismantled the former dams on both these lakes.

Interested in knowing more about these initiatives?

Come visit the park. An audio clip and an interpretive structure fabricated from logs dating to the timber-driving era are presented on the shore of Bouchard Lake. Also, take a minute to linger in dining room of the Rivière-à-la-Pêche Service Centre, where a video shows the development of the new speckled trout population at Tessier Lake. You can also enrich your visit by talking with park naturalists! They have the answers to your questions.