Eradication efforts targeting introduced fish in the high‑mountain lakes of the Pyrenees are progressing well and moving into the final summer campaign of the project. In the fourth year of work, some of the lakes included in the LIFE RESQUE ALPYR project have already reached the planned objectives.

In the Colomers cirque in the Aran Valley, salmonids have been successfully eradicated from Gargolhes Lake, and eradication of Cabidornats Lake is expected to be confirmed this summer. These results, combined with the successful use of chemical methods in Manhera Lake, would mean that the objectives for this sector have been met.

In the Dellui valley (Ribagorça), minnows have been eradicated from Upper Dellui Lake, and work will continue to fully eradicate the trout population.

Work will also continue across the different sectors of Pallars Sobirà to achieve the objectives set for each lake.

In Muntanyó Lake, trout removal efforts are ongoing after having eradicated the minnow population this year—one of the initial targets. In Naorte Lake, where a drastic reduction in the minnow population has been achieved over time, further work will still be needed to ensure complete eradication. In the Peguera valley, efforts also continue in Coveta and Llastra lakes, where the population of introduced salmonids has already been greatly reduced.

Equally noteworthy is the success achieved in the lakes of Tres Estanys del Mig and Tres Estanys de Baix, where chemical eradication methods have been applied to remove introduced fish. These lakes are now considered free of introduced fish.

Across all lakes included in the project, very significant improvements have been observed in invertebrate and amphibian populations, as well as gradual increases in water transparency, whenever the presence of introduced fish has been reduced or eliminated.