Avaliação econômica da aplicação de sistemas de ilhas flutuantes artificiais visando a adequação ambiental de efluentes de empreendimentos aquícolas

Abstract

The need to treat the aquaculture effluent aims to meet the requirements of the new legislation and the pressure from environmental agencies and society itself. Studies that address the preservation of the environment and confront economic indicators are fundamental for the success of the activity, since they are indispensable items for aquaculture sustainability. The objective of this work was to apply different economic indicators as a tool to assess the feasibility of implementing artificial floating island systems (IFAs), used to minimize the environmental impacts caused by the discharge of fish farming effluents. The experiment was carried out in two systems (with and without IFAs, in triplicates) along a semi-intensive production cycle of Nile tilapia. The average values of the production cost and the following economic indicators were calculated regarding the conduct of the production cycle per hectare of water mirror: net financial revenue, profitability index, internal rate of return and net present value. Feed costs were the main parameter that affected production costs, 63.10% for IFAs and 60.12% for without IFAs. The implementation of the structures increased production costs by 4.73%. The study showed that the economic profitability was positive for both production systems. The results found in this study show that the structures of IFAs are tools aimed at the sustainability of fish farming ponds, with lowcost investments and maintenance and that seek adaptation to environmental laws, meeting the needs of small and medium rural producers.