AVALIAÇÃO DOS NÍVEIS DE NITROGÊNIO E FÓSFORO EM CRIAÇÃO DE TILÁPIA EM TANQUE-REDE

Abstract

The particulate organic waste produced in fish farming systems increases the degradation and release of dissolved nutrients. The change in the concentration of dissolved nutrients causes a change in the proportion of nitrogen (N) and phosphorus (P) in the environment, which has been exposed as a probable cause for the growth of algae with or without production of toxins. In this way good management practices can reduce this impact on the environment, but does not define a perennial sustainability, so it is recommended to seek a biodiversity conservation and rational use of natural resources without degradation of aquatic ecosystems. The objective of this work was to evaluate the variations of water quality in tilapia farms in tanks at the Saulo Maia dam in the city of Areia / Paraíba. Where the experiment was conducted, and water samples were collected over a period of 4 months. The analyzed variables were pH, dissolved oxygen and temperature were performed "in situ". In the laboratory, total phosphorus, alkalinity, ammonia and nitrite were determined. The pH and dissolved oxygen of the water were within the ideal range recommended. The values found in the laboratory for alkalinity, ammonia and nitride are in accordance with the limits established in other scientific papers, PTotal found above that recommended in the literature, phosphorus even considered as an element of low toxicity, increased concentrations in the medium should be avoided as they favor nutrient enrichment of the waters resulting in excessive flowering of algae and macrophytes, causing the degeneration of water quality. In general, the analyzed parameters were within the recommended for tilapia creation according to the literature