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Catalonia launches operation to clear fish from reservoir to save drinking water Officials in Catalonia have launched what is being described as an extraordinary operation to clear as many as 1.5 tonnes of fish a day, including many invasive species, from a rapidly dwindling reservoir in the hopes of salvaging drinking water as drought continues to grip the region. The operation is focused on the Sau reservoir, a sprawling body of water flanked by mountains and tree-covered hills about 60 miles north of Barcelona, where water supplies have plunged to their lowest level since 1990. Lac de Montbel, a major reservoir and popular boating lake in the French Pyrenees, is more than 80% empty due to exceptionally low winter rain and snow fall. Starting this week, as many as five fishing boats will be lowered into the Sau with the goal of clearing out as many fish as possible. Any invasive fish caught in the reservoir will be sacrificed, in accordance with local regulations on exotic species, while any fish caught that are native to the area will be released into nearby waters. As many as 60 tonnes of fish could be living in the waters of the Sau, of which an estimated 80% are believed to be invasive species, said Jordi Ruiz of the regional government. “If we do nothing and it doesn’t rain, the fish will die anyway, damaging the quality of the water,” he said. The mass of invasive fish – which range from wels catfish to common carp and pike perch and are believed to have been introduced to the reservoir for sportfishing – are expected to be sent to a local business, which speculated that they could be used to create biodiesel or fertiliser, according to the newspaper El Periódico. Officials are also gradually transferring the remaining water to a nearby reservoir in order to minimise the risk that it could become contaminated as the reservoir is drained. https://www.theguardian.com/world/2023/mar/14/catalonia-operation-clear-fish-sau-reservoir-drinking-water

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