Ann. Limnol. - Int. J. Lim.
Volume 54, 2018
|Number of page(s)||8|
|Published online||22 August 2018|
Spatial and temporal limnological changes of an aquaculture area in a neotropical reservoir
Faculty of Agrarian Science, Federal University of Grande Dourados,
João Rosa Góes Street 1761
Mato Grosso do Sul, Brazil.
2 Center of Engineering and Exact Sciences, State Univeristy of West Paraná, College Street, 645, Toledo, Paraná, Brazil
* Corresponding author: email@example.com
Accepted: 4 June 2018
This study evaluated the spatial and temporal limnological characteristics of an aquaculture area in the Itaipu reservoir, Brazil. During a one-year period, water quality parameters were evaluated in seven collection sites using a fish culture system as the reference point. A regression analysis was performed on water transparency versus chlorophyll a and total phosphorus versus chlorophyll a. The trophic state index (TSI) was calculated using data from water transparency, chlorophyll a, and total phosphorus. In addition, a study of the carrying capacity was conducted in situations of high and low flow and rainfall based on 725 m3 s−1 and 298 mm and 34.5 m3 s−1 and 11 mm, respectively. No difference was observed in the parameters of water quality and the TSI in relation to the collection sites; these parameters only varied significantly throughout the seasons. The regression analysis showed that increased total phosphorus in the environment leads to increase in chlorophyll a concentrations and consequently decreased water transparency. Evaluation of the carrying capacity demonstrated that under conditions of high precipitation and flow it is possible to produce 623.7 tons of fish per year, which is above the total cultivated in fish farms at the study site.
Key words: Carrying capacity / eutrophication / reservoir management / trophic status index
© EDP Sciences, 2018
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