Author(s): Cacilda TJ Mercante, Gianmarco S David, Claudinei J Rodrigues, Clovis F do Carmo and Reinaldo J da Silva

Abstract: The use of reservoirs for aquaculture is yet a common practice in many countries and due to its potentially polluting impact is considered the main activity that restricts the multiple uses of water reservoirs. Ammonia is the main nitrogen product of protein catabolism and can cause chronic and acute toxic effects even at relatively low concentrations. Therefore, this compound should be closely monitored in fish farming. In the present study, the water quality of six tilapia production systems located in three reservoirs of São Paulo state (Brazil) was monitored during 2014-2016. The proximity between farms negatively affected farming, with ammonia concentrations above the safe limit. The pH had significantly affected the fractionation of the total ammoniacal nitrogen. Our results indicated that natural conditions (i.e. drought) and anthropogenic activities in the watershed of the reservoirs affected the water quality more significantly than the aquiculture practices in the net cages.

Pages: 256-261  |  1269 Views  444 Downloads

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