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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 dissolved oxygen levels throughout the year. Due to limited nutrient availability, primary __________ _________ ______ __________ ____ _________.
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