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Oligotrophic and eutrophic lakes represent two contrasting types of freshwater ecosystems that differ mainly in nutrient status, biological productivity, and suitability for aquaculture practices. An oligotrophic lake is characterized by low concentrations of nutrients such as nitrogen and phosphorus. These lakes generally have clear water, greater depth, and high _________ ________ ______ _________ ______ ___ _______ ________.
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