Nitrogen cycle in bio-floc ponds. The nitrogen cycle is similar to that of in water ponds with periphyton. In contrast to the periphyton system, this
system is also applicable to intensive systems. The added carbon source, together with the waste nitrogen, is converted into microbial bio-flocs, which in
turn can be eaten by the cultured organism. This technique provides an inexpensive protein source with a higher efficiency of nutrient conversion of feed.