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

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.

Bibliographic Details

Main Authors:	ARAÚJO, C. A. S. de, SAMPAIO, F. G., ALCÂNTARA, E., CURTARELLI, M. P., OGASHAWARA, I., STECH, J. L.
Other Authors:	CARLOS ALBERTO SAMPAIO DE ARAUJO, INPE; FERNANDA GARCIA SAMPAIO, CNPMA; ENNER ALCANTARA, UNESP; MARCELO PEDROSO CURTARELLI, Fundação Centros de Referência em Tecnologias Inovadoras; IGOR OGAHSAWARA, Indiana University-Purdue University Indianapolis; JOSÉ LUIZ STECH, INPE.
Format:	Separatas biblioteca
Language:	English eng
Published:	2017-12-12
Subjects:	Cold front, Frente fria., Aquacultura, Lago, Tilápia nilótica, Qualidade da água, Oreochromis Niloticus., Water reservoirs, Aquaculture, Water quality.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1082243 https://doi.org/10.3354/aei00240
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