Impactos ambientais do lançamento de efluentes da carcinicultura em águas interiores

Figueiredo, Maria Clea de de Brito; Araújo, Lúcia de Fátima; Gomes, Raimundo Bemvindo; Rosa, Morsyleide de Freitas; Paulino, Walt Disney; Morais, Lúcia de Fátima Sabóia de

doi:10.1590/s1413-41522005000200011

Cited by 27 publications

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“…This figure is very similar to the EFs derived from the Jaguaribe farms (Figueiredo et al, 2005;Lacerda et al, 2006). From 2001 to 2006, P loads varied mostly following the increase in the total pond area.…”

Section: Resultssupporting

confidence: 82%

“…Among anthropogenic sources, intensive shrimp aquaculture accounted for environmental impacts associated with the emission of large amounts of P directly to estuarine waters Jackson et al, 2003). For example, in northeast Brazil emission scenarios for 25 estuaries showed that shrimp farming P contribution varied from <1 to 13% of the total anthropogenic P emission and in many areas compares with emissions from waste waters and agriculture (Figueiredo et al, 2005;Lacerda et al, 2008). In the Gulf of California, P derived from intensive shrimp farming reaches 1,600 t annually, representing 7% of the total P from the region's agriculture.…”

Section: Introductionmentioning

confidence: 99%

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Anthropogenic sources and distribution of phosphorus in sediments from the Jaguaribe River estuary, NE, Brazil

Marins¹,

Filho²,

Eschrique³

et al. 2011

Braz. J. Biol.

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This paper estimates annual P emission to the Jaguaribe River estuary, NE Brazil, responsible for approximately 30% of the country's farmed shrimp production. Emissions increased three times between 2001 and 2006 and reached 43.9 t.year -1. These emissions make aquaculture the third main source of P for this estuary and are much smaller than emissions from agricultural sources and slightly lower than emissions from wastewater. Their relative contribution also increased from 10.5% to 20.5%. Temporal variability of P concentrations in estuarine bottom sediments also suggest an increase, but not as evident as the emissions. The spatial distribution and speciation of P (total P and inorganic P) in sampling stations located upstream and downstream from the main aquaculture area confirmed the importance of this source. Inorganic P was the dominant form present in sediments downstream and showed an increase from 67% to 75% of the total P present in the sediment.Keywords: nutrients, emission, estuary, shrimp culture, wastewaters. Emissão e distribuição de fósforo de fontes antrópicas no estuário do rio Jaguaribe, Nordeste do BrasilResumo É apresentada uma estimativa da emissão anual de P para o estuário do rio Jaguaribe, Ceará, Nordeste do Brasil, área responsável por cerca de 30% da produção total de camarão cultivado no país. As emissões aumentaram por um fator de três entre 2001 e 2006, atingindo 43,9 t.year -1 . Essa emissão coloca a aquacultura como a terceira fonte principal de P para esse estuário, sendo bem menor que a emissão de fontes agrícolas e um pouco menor que as emissões por águas servidas. A contribuição relativa da aquacultura também aumentou de 10,5% a 20,5%, no mesmo período. A variação temporal das concentrações de P em sedimentos estuarinos sugere um aumento no período, porém não tão evidente quanto das emissões. A distribuição espacial e a especiação do P (P total e P inorgânico) em estações de coleta localizadas à montante e à jusante da principal área de aquacultura confirmaram a importância desta fonte. O P inorgânico foi a forma dominante presente em sedimentos à jusante e mostrou um aumento de 67% a 75% do total de P presente no sedimento.Palavras-chave: nutrientes, emissão, estuário, carcinicultura, águas servidas.

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Section: Resultssupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Anthropogenic sources and distribution of phosphorus in sediments from the Jaguaribe River estuary, NE, Brazil

Marins¹,

Filho²,

Eschrique³

et al. 2011

Braz. J. Biol.

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“…It also includes mangrove areas, covering about 12 km 2 , in the lower estuary. The estuarine region is of great economic importance due to shrimp farming which has adapted the species cultivated to farming conditions, and also to the great profitability of the enterprise (FIGUEIREDO et al, 2005). Shrimp have a particularly important effect on the hydrodynamics of the estuarine system.…”

Section: Study Areamentioning

confidence: 99%

Intra-tidal variation of stratification in a semi-arid estuary under the impact of flow regulation

2013

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A B S T R A C TThe Jaguaribe River is the largest semi-arid Brazilian river and represents an important water source for the state of Ceará. The Castanhão Weir, built to regulate the flow of the Jaguaribe, began operating successfully in the 1990s. As a result, the hydrodynamic regime of the estuary has undergone alteration and is no longer subject to the former annual climatological variability of the dry and rainy seasons. This paper introduces an assessment of the changes in the hydrological conditions resulting from the construction of the weir and investigates the structure of the density stratification in the estuary. A field experiment was conducted at the end of the dry season in November 2009, during which salinity and temperature were monitored at different levels for three tidal cycles. The temporal variations in salinity and temperature during the tidal cycles were 16 psu and 1.5°C, respectively. The salinity exhibited a vertical variation of four units, while the temperature variation was much lower. Several stratification indicators were calculated from the observed density: the stratification coefficient, the Brunt-Väisälä frequency and the potential energy anomaly. The results showed that the parameters behave similarly, differences being observed only in their relative magnitudes. The vertical structure of the estuary exhibited marked stratification during the ebb tide but vertical homogeneity during both flood and high tide. With the regularized flow existing under present conditions, the estuary exhibits hyposaline and a partially mixed structure for the period studied, despite the typical expectation of a hypersaline and well-mixed vertical structure. R E S U M OO rio Jaguaribe é o maior rio do semi-árido brasileiro, constituindo uma importante fonte de água para o estado do Ceará. Na década de 1990 entrou em operação o Açude do Castanhão com o objetivo de regularizar a vazão do rio Jaguaribe, o qual obteve grande sucesso. Como consequência foi alterado o regime hidrodinâmico do estuário, o qual atualmente não está mais sujeito a variabilidade climatológica anual de estações seca e chuvosa. O presente trabalho apresenta uma avaliação da mudança do regime hidrológico antes e após a construção do açude, e investiga a estrutura de estratificação da densidade nos estuários. Foi realizado um experimento de campo em novembro de 2009, no fim da estação seca, quando a salinidade e temperatura da água foram monitorados em diferentes níveis durante três ciclos de maré. A variação temporal da salinidade e temperatura durante os ciclos de maré foram de 16 psu e 1,5ºC, respectivamente. A salinidade chegou a apresentar variação vertical de 4 unidades, enquanto que a variação da temperatura foi bem inferior. Foram calculados parâmetros indicadores da estratificação a partir da densidade: coeficiente de estratificação; frequência de Brunt-Väisälä; e a anomalia da energia potencial. Os resultados mostraram que os parâmetros comportam-se da mesma maneira, apenas com diferença da magnitude relativa de seus valo...

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“…Although the Cu content in the suspended solids also increased from 38.4 to 58.3 µg.g -1 in the intake canal and pond waters to 66.8 µg.g -1 in draining waters, changes in concentrations are not the major factor responsible for the large particulate Cu measured in draining waters, rather these high particulate Cu concentrations result mostly from an enormous increase in total load of suspended solids to the canal waters, which increased form a range of 87-164 mg.L -1 , in the intake canal and pond waters to 1,675 mg.L -1 in draining waters. Most of this large particulate export occurs at the end of the draining process, when the water-sediment interface, mostly constituted with a nefloid layer, is carried into the draining flux (Figueiredo et al, 2005;Lacerda et al, 2006). Therefore, most Cu emission from these farms occurs through particulate Cu exportation.…”

Section: Copper Concentrations In Water and Suspended Solidsmentioning

confidence: 99%

Fate of copper in intensive shrimp farms: bioaccumulation and deposition in pond sediments

2009

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We present the distribution of Cu in water, sediments and biomass from intensive shrimp (Litopenaeus vannamei Boone, 1931)) farming in northeastern Brazil. The results show no difference in dissolved Cu concentrations between waters entering and leaving the ponds. However, there was a large export of particulate Cu to adjacent environments, showed by extremely high particulate (112 µg.L , being 5 to 7 times higher than the local background. Pond management procedures result in a peculiar vertical distribution of Cu with peak values occurring at sub-surface depths in pond bottom sediments. Bioavailable Cu reaches about 20% of the total Cu content in sediments. Notwithstanding the relatively high Cu bioavailability, concentrations in shrimp muscle (23.2 to 63.4 µg.g -1 d.w.) were similar to reported values for reared and natural L. vannamei populations, and much lower than acceptable maximum limits for human consumption. Concentrations in the exoskeleton were always higher than in muscle. Increasing Cu mass, and to a lesser extent Cu concentrations in muscle tissues, occurred simultaneously to a decrease in Cu mass and concentrations in the exoskeleton and vice versa, suggesting a dynamical exchange of Cu between the two compartments. Although Cu fate in intensive shrimp culture does not result in increasing Cu exposure to consumers, the activity is an important source of this metal to adjacent ecosystems, in particular in the pristine environments where most aquaculture activities in NE Brazil takes place. , sendo estes valores de 5 a 7 vezes mais altos que as concentrações naturais dos solos e sedimentos locais. O manejo dos tanques de criação resulta em perfis de distribuição de Cu em sedimentos com maiores concentrações em subsuperfície. A biodisponibilidade do Cu nestes sedimentos é elevada e atinge cerca de 20% da concentração total. Apesar da biodisponibilidade elevada, as concentrações de Cu em músculo do L. vannamei (23.2 a 63.4 µg.g -1 peso seco) são similares aos valores reportados para populações naturais da espécie e em diversos de cultivo em outros países, e estão bem abaixo dos limites máximos permitidos para consumo humano. As concentrações de Cu no exoesqueleto foram maiores que no músculo. Um aumento da massa de Cu em músculo ocorreu simultaneamente à diminuição do Cu no exoesqueleto e vice-versa sugerindo uma troca dinâmica do Cu entre os dois compartimentos. Embora a presença do Cu no cultivo intensivo do L. vannamei não represente exposição significativa para os consumidores, a atividade é fonte importante de Cu para os sistemas aquáticos adjacentes. KeywordsPalavras-chave: carcinicultura intensiva, cobre, exportação e acumulação de Cu, Nordeste do Brasil. , 2002). Therefore, dilution capacity of the estuary has been decreasing over the past decades, maximizing the potential effect of pollutant emissions from anthropogenic sources.

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Impactos ambientais do lançamento de efluentes da carcinicultura em águas interiores

Cited by 27 publications

References 0 publications

Anthropogenic sources and distribution of phosphorus in sediments from the Jaguaribe River estuary, NE, Brazil

Anthropogenic sources and distribution of phosphorus in sediments from the Jaguaribe River estuary, NE, Brazil

Intra-tidal variation of stratification in a semi-arid estuary under the impact of flow regulation

Fate of copper in intensive shrimp farms: bioaccumulation and deposition in pond sediments

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