Evaluation of the trophic state index of the sucupira aquiculture park, lajeado reservoir, in Palmas, Brazil

Abstract

Aquaculture is a growing activity within the food producing segments, however, it may affect the environment. Current analysis studied the trophic state of the Sucupira Aquaculture Park, an area for fish cultivation in net cages locateds in Lajeado Reservoir - Palmas (TO) - Brazil, applying the Trophic State Index (TSI)). Monitoring was undertaken between January and April of 2017 and comprised sampling for the analysis of total phosphorus and chlorophyll-a. Water quality data as temperature, turbidity, dissolved oxygen, conductivity, pH and dissolved total solids were obtained in loco. Considering the TSI resultsbetween January and April, the area was predominantly supereutrophic. It can be observed that the lake's trophic statewithin t aquaculture area is highly influenced by the rainy period. Since studies were not undertaken during the dry period, the differences between rain effects and fish farming activities were not possible to be detected. Further studies are required to understand the effects of aquaculture activities in the environment in a short and medium term by limnological monitoring. © 2019 University Center of Maringa. All rights reserved.