Short term variations of nutrients in experimental culture of tilapia (Oreochromis niloticus) and potential load of N and P from culture areas in a tropical estuary (Bahia, Brazil)
DOI:
https://doi.org/10.2312/Actafish.2017.5.3.90-101Palavras-chave:
Nutrientes, Aquacultura, TilápiaResumo
Abstract The present study was carried out in a tilapia culture system from a tropical estuarine system of the Tinharé-Boipeba Islands Archipelago (ESTBIA) on the northeast Brazilian coast (Bahia State – Brazil) and quantified the potential nutrient load from this activity into the waters. Organic and inorganic species of carbon, nitrogen and phosphorus (POC, DOC, TN, TP, PON, POP, NH4+, NO2-, NO3-, and PO43-) were monitored in experimental tanks during four days, as well as the seston, water temperature, pH, Eh, and Dissolved Oxygen. The data-set were obtained from tanks with fish fed and not fed through experiment period in order to assess the loads of N and P from fish and fish feed contributions. Three series of tanks were prepared: Control Series – CT; Non-Feeding Fish Series – NFF; and Feeding Fish Series – FF. The comparison of the three treatments showed that the FF Series was marked by the highest variations of physical-chemical parameters due the influence of fish feed residues in tanks. Based on the parameters analyzed, the estimated annual nutrient loads for the culture area would be 55 tons of TN and 9 tons of TP. The fish feed would be responsible for 64% of nitrogen and 90% of the total phosphorus loads by culture of tilapia.
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