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In the present work, the main goal was to analyze the influence of multiple shrimp farms discharges on water quality of the PJE with different strategies of harvest, including a scenario with harvest forecasted by a stochastic model ( Roversi 2018). This estuary, where commercial shrimp farming first took place in Brazil, has several shrimp farming ponds along its banks that have promoted marked changes in the ecosystem, which contributed to devastation of at least 30% of the mangrove ( Souza & Ramos e Silva 2011). The Potengi/JundiaĆ Estuary (PJE), on the Northeastern Brazilian coast, is under anthropic discharges that include aquaculture, industrial and domestic wastewater, along surface runoff from agricultural areas. Nutrients from shrimp farming and urban areas are the most common pollution sources in estuaries and coastal lagoons in Northeastern Brazil ( Barcellos et al.
#Tropico 1 pollution series#
Defining the harvest time series for multiple farms is a challenge, due to the difficulty in acquiring data and quantifying all discharges. Little is known about synergistic effect of multiple ponds discharge. (2010) assessed shrimp farm effluents under intensive, semi-intensive and organic management, observing that variations in organic residue management lead to different water quality standards, more intensive systems lead to worse water quality.
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(2011) monitored the effluents and pond water on a shrimp farm, observing seasonal variations in water quality, and demonstrated that farm management should be adapted to each season. (2018) observed that shrimp farms' discharges induced salinization increasing at least 3.0 psu at a subtropical coastal lagoon for up to 2 tidal cycles.
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Using computational modeling, Cardoso-Mohedano et al. In general, research about shrimp farming impact on coastal ecosystems focuses on the effluent's composition or the effect of a single farm discharge. There were no significant differences in the average and maximum variations in nutrient and organic matter concentrations between the different management techniques. Results indicate that shrimp farming is not the main anthropogenic source of pollution in the estuary studied. The harvesting scenarios were compared to a scenario without the activity. A hydrodynamic circulation and water quality model were implemented to evaluate the dispersion of pollutants using different discharge combinations. Two other scenarios with harvests concentrated during spring and neap tides were also analyzed, showing waste management techniques that can reduce the impact of shrimp aquaculture on coastal areas.
#Tropico 1 pollution generator#
In this study, a harvest time series generator is used to analyze the impact of the synergistic effect of several shrimp farm harvests in a tropical estuary. The impacts of shrimp farming are often investigated by the unit effect of a farm. Shrimp farms cause environmental impacts in coastal ecosystems, compromising water quality by discharging effluents rich in nutrients and organic matter.