Question 15191 — streams, ponds and lakes

Summary

Mr. Arnaud Viala alerts the Minister of State, Minister of Ecological and Inclusive Transition, to the proliferation of invasive aquatic plants in freshwater lakes in France. More and more lakes in France are seriously affected by the exponential proliferation of invasive aquatic plants, accidentally imported by aquarists into French territory and dumped into ecosystems. It mainly concerns the lagarosiphon major and egerias. The proliferation of these plants constitutes a real nuisance and ultimately a threat to the aquatic ecosystems of these lakes, but also to local residents, boaters, municipalities and fishermen. In addition to the sometimes nauseating odors that piles of plants can give off during periods of high heat, their concentration and density make many areas impossible for navigation, fishing, nautical activities, with a potential danger for people falling into the water to find themselves tangled and drowned, trapped in these plants (this has already happened in the Médoc lakes in particular). These nuisances constitute a real loss of income for municipalities engaged in nautical activities as well as for fish farming activities. Spaces find themselves asphyxiated, the density of plants deprives the entire aquatic ecosystem of sun and nothing can develop. Ultimately, there is a risk of death of these aquatic spaces. Municipalities very often find themselves without material or financial resources in the face of this invasion and uprooting campaigns only resolve the problem very punctually and a few months later the plants return even more densely. He asks him what support and control measures can be implemented. in place to help municipalities stem the proliferation of these plants in a sustainable manner.

Machine translation from French. The official text remains authoritative.

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