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Aquaculture Environment Interactions

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AEI 9:385-403 (2017)  -  DOI:

Effects of atmospheric cold fronts on stratification and water quality of a tropical reservoir: implications for aquaculture

Carlos A. S. Araújo1,6,*, Fernanda G. Sampaio2, Enner Alcântara3, Marcelo P. Curtarelli4, Igor Ogashawara5, José L. Stech1

1Remote Sensing Division, National Institute for Space Research, 12227-010 São José dos Campos, SP, Brazil
2Embrapa Environment, Brazilian Agricultural Research Corporation, 13820-000 Jaguariúna, SP, Brazil
3Department of Environmental Engineering, São Paulo State University, 12247-004 São José dos Campos, SP, Brazil
4Green Economy Center, Reference Center Foundation for Innovative Technologies, 88040-970 Florianópolis, SC, Brazil
5Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
6Present address: Département de Biologie, Chimie et Géographie, Université du Québec à Rimouski, Rimouski, QC G5L 3A1, Canada

ABSTRACT: Stratification and mixing patterns of a water body are influenced by the variability of atmospheric systems, which can also modify their biogeochemical properties. The primary goal of this study was to analyze the effect of atmospheric cold fronts (CFs) on thermal stratification and water quality parameters in 4 embayments of the Furnas Hydroelectric Reservoir (FHR) (southeastern Brazil), a warm monomictic water body. A secondary goal was to evaluate the implications of this effect on the aquaculture of Nile tilapia Oreochromis niloticus (L.) in net cages. A 2 yr dataset of meteorological and water quality parameters was used to compute heat flux balance components and buoyancy frequency. These parameters were used to evaluate the influence of CFs on FHR water column stability and water quality. It was observed that the passing of CFs increased net heat loss and wind velocity, resulting in a partial mixture of surface waters with deeper layers. These changes in the physical structure of the water column altered the diel cycle of water temperature, led to a slight decrease in dissolved oxygen concentrations and pH values during the stratification period, and contributed to the increase in dilution power at the fish cultivation sites. However, following CF passages, no significant changes were observed in water quality parameters that influenced Nile tilapia cultivation in the FHR. Nevertheless, the understanding of meteorological systems and their influence on the physical and biogeochemical properties of an aquatic system is important for optimal management of aquaculture activities.

KEY WORDS: Tropical reservoir · Cold fronts · Water quality parameters · Aquaculture · Nile tilapia

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Cite this article as: Araújo CAS, Sampaio FG, Alcântara E, Curtarelli MP, Ogashawara I, Stech JL (2017) Effects of atmospheric cold fronts on stratification and water quality of a tropical reservoir: implications for aquaculture. Aquacult Environ Interact 9:385-403.

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