Calidad de agua y balance de nutrientes en un cultivo experimental cerrado de tilapia Oreochromis niloticus
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Resumen
Two experiments were conducted in an effort to determine the effects of stocking density, water quality, tilapia growth performance, and nutrient distribution and budget. Experiment was designed for an intensive culture of tilapia Oreochromis niloticus in recirculating aquaculture systems (RAS). Tilapia weight gain and production was higher in the treatment with higher stocking density. Total nitrogen, nitrite-nitrogen, nitratenitrogen, total phosphorus and phosphorus dissolved concentrations in all the treatments remained low in the safe range for tilapia during the study period. The major source of nutrient input was feed, tilapia feed accounted for 71-75% nitrogen and 53-65% phosphorus of the total inputs. Nutrient budget revealed the feed input, 40-43% of the nitrogen and 61-70% of the phosphorus were incorporated in the fish harvested. The production of one kilogram of tilapia required 1.8-1.9 kg of feed in different treatments, while 26-28 g nitrogen and 11-15 g phosphorus were released into the water, as metabolic waste. The drained water at harvest contained 13.0% nitrogen and 12.4% phosphorus of the total inputs. The study has demonstrated that RAS tilapia culture system can maintain acceptable water quality for tilapia growth, to increased efficiency and reduce nutrient loss through pond effluents.
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