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Why does phosphorus tend to accumulate in a closed Recirculating Aquaculture System?

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1. Why does phosphorus tend to accumulate in a closed Recirculating Aquaculture System?

Biofilters release phosphorus as a by-product of nitrification

Denitrifying bacteria convert nitrate into phosphate

Phosphorus enters through the feed, and nitrifying biofilters do not remove it

Mechanical filters concentrate dissolved phosphate back into the tanks

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