Question 13601 — environment

Summary

Mr. Hadrien Clouet draws the attention of the Minister of Ecological Transition, Biodiversity and International Negotiations on Climate and Nature to the ecological crisis caused by the stocking of high mountain lakes. A considerable proportion of these lakes, naturally devoid of fish, have been artificially stocked or continue to be stocked. However, opinion 2025-13 of the Regional Scientific Council for Natural Heritage (CSRPN) of Occitanie clearly establishes that this practice alters the ecological functioning of lakes, threatens biodiversity and degrades the water quality of these ecosystems already weakened by climate change and pollution. These transformations risk leading to a loss of their cultural and heritage value, with potential repercussions on the tourist attractiveness of the territories concerned. However, Experiments conducted in pilot lakes in the Spanish Pyrenees and Italian Alps demonstrate that ecological restoration is possible through the removal of introduced fish. In view of these elements, is the Minister considering strictly limiting stocking in high mountains and banning this practice in lakes located within national parks? Does the Minister intend to initiate measures to restore the mountain lakes, particularly as part of the implementation of the European regulation on the restoration of nature adopted in 2024, which provides for the restoration of 90% of degraded environments of European interest by 2050, even though the national plan “Acting for Nature”, currently in preparation, does not mention these ecosystems? He asks her for her position on this subject.

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