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Marble trout is the biggest and the most iconic species of Trout in Slovenia, while also being the rarest. It almost disappeared because of the introduction of Brown Trout into the same water and the subsequent hybridization of the two but was preserved with repopulation and careful supervision. It is only found in the river SoÄŤa and its tributaries, with the average catch 30-70 cm long, all the way up to 130 cm.