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Aquaculture is the fastest growing activity among food production sectors, however, it may cause environmental impacts if a monitoring plan is not adopted. The objective of the present study was to evaluate the Trophic State Index (TSI) as a tool to monitor aquaculture activity. The study was conducted in Parque Aquicola Sucupira, an area that cultivates fish in a net cage system in Lajeado Reservoir, Palmas, Tocantins. Monitoring was carried out from January to August 2017 and involved sampling to analyze the following water quality parameters: total phosphorus and chlorophyll a. At the same time, other parameters were analyzed in loco: temperature, turbidity, dissolved oxygen, conductivity, pH and total dissolved solids. The results showed that the concentrations of most of the limnological parameters were under the maximum regulatory limits required in the CONAMA 357/05 legislation. The Trophic State Index (TSI) results showed that the study area was predominantly in a supereutrophic state and that the trophic state of the reservoir around the aquaculture area is strongly influenced by anthropic activities, mainly during the rainy season. In the dry season, since nutrients are not diluted, an increase in phosphorus concentration was recorded, which led to a hypereutrophic state. This result could be because the lake naturally has high levels of phosphorus. Since it was not possible to affirm if aquaculture was the impacting activity, future studies should adopt a monitoring program with a more comprehensive sampling effort.

Avaliação do Índice de Estado Trófico como ferramenta para monitoramento de atividades aquícolas em reservatórios continentais