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<p>Our freshwater ecosystems are facing numerous challenges. Many of New Zealand’s lakes have lost much of their native underwater plant life. At the Ruakura ‘tank farm’ in Hamilton, researchers have been working on a project to help restore the freshwater forests. </p><p><strong><em><a href="https://radionz.us6.list-manage.com/subscribe?u=211a938dcf3e634ba2427dde9&id=81ad21bafe">Sign up to the Our Changing World monthly newsletter</a> for episode backstories, science analysis and more.</em></strong></p><p><strong>Learn more:</strong></p><ul><li>Listen to <a href="https://www.rnz.co.nz/programmes/black-sheep/story/2018756857/invasive-the-story-of-stewart-smith">Invasive: the story of Stewart Smith</a> from the Black Sheep podcast to learn more about New Zealand’s pest fish issue.</li><li>Read more about the koi carp bow hunting that <a href="https://www.rnz.co.nz/news/sport/577586/tonnes-of-pest-fish-taken-out-in-bow-hunting-competition">removed tonnes of pest fish</a>.</li><li>Whi...