Avaliação da capacidade de suporte de reservatório para operação de parque aquícola através de modelo de estimativa – Aplicação no braço São Francisco Verdadeiro do reservatório de Itaipu

Abstract

Aquaculture in cages is a high-growth activity in Brazil and in the world, due to the possibility of increased production and quality of fish. Although the cultivation in cages be advantageous, this form of creation in which organisms are confined presents a risk to the environment, when not properly managed, since the nutrient input can cause eutrophication. As the production of fish in cages is heavily dependent on water quality, because the animals need environmental conditions to develop their own waste activity can damage it and make it unfeasible, besides causing societal environmental damage. Thus, it is necessary to conduct studies to assess the ability of water resources has in debug alone the total phosphorus load from the aquaculture park, preventing the system unbalance. This study aimed to assess the carrying capacity for cages operation in aquaculture sites in São Francisco Verdadeiro affluent of the Itaipu hydroelectric plant reservoir using the mathematical model estimation Dillon & Rigler. According to the estimate of supportability is possible to produce 817.4 tonnes of fish in 2015 São Francisco Verdadeiro affluent. There is a negative linear correlation between the increase in phosphorus content in total water body and the production of fish, which result great loss in production with the small increase in the concentration of phosphorus. This fact highlights the importance of monitoring and management for the control of point and diffuse sources of total phosphorus. The model of Dillon freehold Rigler can be recommended for management of aquaculture parks with limited information and resources, or wishing to convenience of calculation, starting the studies of capacity to support, in order to familiarize the user with the subject and gain experience.