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Imagine a large alpine area, a block of 500 or more hectares that was declared no kill and set under strict nature conservation rules, aiming to maintain and improve biological diversity and water purity. Assuming that fish had no uncrossable hurdle like dams, such an island would function as a lung for the all downstream areas, allowing nature to breathe,fish spawn and re-populate the connected streams through the natural fish migration patterns. And if each water basin was provided with such an island..