Assessment of environmental impacts of the semi-intensive tilapia culture system
DOI:
https://doi.org/10.5902/2236130819564Palabras clave:
Impact of wastewaters, Fish farming, TilapiaResumen
The main objective of the present study is to assess the physical, chemical and bacteriological characteristics of continuous wastewater and of fish harvesting in tilapia (Oreochromis niloticus) farming, considering the possible effects of wastewater discharges and alternatives to minimize their effects. The samples were collected between April and October, thus spanning the whole developmental cycle of tilapia. The dissolved oxygen demand is the major cause of environmental problems, but the eutrophication index is low despite considerable total phosphorus levels compared to the legal standards established by Resolution 357/05 of the Brazilian National Environmental Council (CONAMA). The environmental pressure index amounted to 2.47, which underscores the necessity for measures that can minimize this impact. The use of wastewaters in irrigation is the best alternative, resulting in rational water use, lower fertilizer utilization rates and reduction of water pollution.
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