Abstract
Water quality and the quantification of the pollutant load generated in systems for aquaculture production are essential for the sustainable management of aquatic ecosystems and for the adoption of measures that may mitigate possible environmental impacts [1].
Highlights
Water quality and the quantification of the pollutant load generated in systems for aquaculture production are essential for the sustainable management of aquatic ecosystems and for the adoption of measures that may mitigate possible environmental impacts [1]. (Period) Trout is a salmonid very sensitive to pollution, temperature increases and low amount of dissolved oxygen, being a very exigent fish with regard to the physicochemical and microbiological variables of the water [2]
Periodic water samplings for raceway system evaluation are required during rainbow trout cultivation and should be performed frequently. These analyzes, in addition to providing data on water quality [7], may indicate the level of pollution of rivers and streams [8]. They are essential to predict the impacts generated by trout farm, since the discharge of water to its receiving beds must be done with a quality at least equal to that captured, according to the current brazilian legislation (CONAMA Resolution No 357/2005 and COPAM/CERH -MG No1-2008) and despite continuous flow systems with high water recirculation, it can show differences between the physicochemical and microbiological characteristics of the water during the production cycle, besides being able to affect the physiological state of the trout and the water quality of the sources that receive their effluents
In relation to assessments of the pollutant load, the two trout farms studied represented a low risk of eutrophication to the bodies of water downstream, but it is still necessary to make a constant evaluation of water quality to ensure that these characteristics are maintained and that comply with environmental legislation
Summary
Water quality and the quantification of the pollutant load generated in systems for aquaculture production are essential for the sustainable management of aquatic ecosystems and for the adoption of measures that may mitigate possible environmental impacts [1]. (Period) Trout is a salmonid very sensitive to pollution, temperature increases and low amount of dissolved oxygen, being a very exigent fish with regard to the physicochemical and microbiological variables of the water [2]. These analyzes, in addition to providing data on water quality [7], may indicate the level of pollution of rivers and streams [8] They are essential to predict the impacts generated by trout farm, since the discharge of water to its receiving beds must be done with a quality at least equal to that captured, according to the current brazilian legislation (CONAMA Resolution No 357/2005 and COPAM/CERH -MG No1-2008) and despite continuous flow systems with high water recirculation, it can show differences between the physicochemical and microbiological characteristics of the water during the production cycle, besides being able to affect the physiological state of the trout and the water quality of the sources that receive their effluents. In view of the above, the objective was to evaluate the water quality and the polluting load generated by two commercial trout farm in a raceway system
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