Environmental Implications of Intensive Marine Aquaculture in Earthen Ponds

Tovar, Antonio; Moreno, Carlos; Mánuel-Vez, Manuel P.; Garcı́a-Vargas, Manuel

doi:10.1016/s0025-326x(00)00040-0

Cited by 69 publications

(20 citation statements)

References 11 publications

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“…At the end of the germination period (day 8) the plants were approximately 14.0 cm in height. The plants continued to grow rapidly and fairly uniformly and showed no signs of mineral deficiency or disease during the growth period (days [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. At the end of the growth period, the plants reached an average height of 25.5 cm (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…McIntosh and Fitzsimmons [7] reported mean effluent concentrations from an inland, low-salinity shrimp farm in terms of TN, NH 3 -N, NO 2 -N, NO 3 -N, TP, reactive phosphorus, alkalinity, COD, BOD, TSS and VSS of 9, 0.17, 0.261, 9.8, 0.74, 0.33, 96, 23, 6.40, 46.8, 24.1 mg L 1 , respectively. Tovar et al [8] reported that for each tonne of gilthead seabream (Sparus aurata) produced, 9104.57 kg of TSS, 843.20 kg of POM, 235.40 kg of BOD, 36.41 kg of NH 4 -N, 4.95 kg of NO 2 -N, 6.37 kg of NO 3 -N and 2.57 kg of PO 4 -P were released to the environment.…”

Section: Introductionmentioning

confidence: 99%

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Use of Barley for the Purification of Aquaculture Wastewater in a Hydroponics System

Snow¹,

Ghaly²

2008

American J. of Environmental Sciences

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Barley was examined for its ability to remove nutrients from aquaculture wastewater. The effects of seed sterilization using ethanol and bleach and seed density on germination and plant growth were investigated. Surface sterilization of barley seeds had a negative impact on germination. Increasing the ethanol concentration and/or the bleach concentration reduced the germination percentage. Barley seeds were first germinated in water in the hydroponics system. The seedlings then received wastewater from an aquaculture system stocked with Arctic charr. During the experiment, the crops grew rapidly and fairly uniformly and showed no signs of mineral deficiency or disease. The average crop height at harvest was 25.5 cm and the yield varied from 25 to 59 t ha 1 , depending on the seed density. The hydroponically grown barley was able to significantly reduce the pollution load of the aquaculture wastewater. The TS, COD, NH 4 + -N, NO 2 --N, NO 3 --N, and PO 4 3--P reductions ranged from 52.7 to 60.5%, from 72.9 to 83.1%, from 76.0 to 76.0%, from 97.6 to 99.2%, from 76.9 to 81.6% and from 87.1 to 95.1%, respectively. However, the effluent produced from the hydroponics system had slightly higher levels of TS (420-485 mg L 1 ) than the 480 mg L 1 recommended for aquatic animals. A sedimentation/filtration unit should be added to the hydroponics system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of Barley for the Purification of Aquaculture Wastewater in a Hydroponics System

Snow¹,

Ghaly²

2008

American J. of Environmental Sciences

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“…The 157 km long Guadalete River, which receives the effluent of the wastewater treatment plant of Jerez de la Frontera (200 000 inhabitants) and the drainage from agricultural cultivations, flows into the outer bay. Nearby, a shallow tidal creek (Río San Pedro), affected by the discharges from surrounding aquaculture installations (Tovar et al 2000), also flows into the bay.…”

Section: Methodsmentioning

confidence: 99%

Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Ferrón

Alonso-Pérez²,

Anfuso³

et al. 2009

Mar. Ecol. Prog. Ser.

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Benthic fluxes of nutrients and dissolved nitrous oxide (N 2 O) were determined by benthic chamber incubations in 2 regions on the northeastern near-shore continental shelf of the Gulf of Cádiz (depth range: 8 to 34 m), one off the Guadalquivir River mouth and the other in the Bay of Cádiz and its neighboring shelf. In total, 25 in situ benthic chamber incubations were performed dur- , accounted on average for <1% of total inorganic nitrogen fluxes. The regeneration of NH 4 + and Si(OH) 4 was mainly influenced by organic carbon oxidation rates and bulk organic carbon in surface sediments, whereas HPO 4 2 -regeneration was mostly influenced by bottom water oxygen concentration and water depth. Denitrification was estimated to account for between 9 and 13% of organic matter remineralization and for a loss of between 57 and 67% of potentially recyclable nitrogen. Overall, benthic remineralization was estimated to degrade about 47% of overlying primary production, supplying about 15 and 12% of the phytoplankton N and P requirements, respectively. This highlights the importance of benthic organic matter remineralization on the biogeochemistry of the northeastern continental shelf of the Gulf of Cádiz.

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“…The seasonal nitrate maximum occurred during winter (maximum value 71.76 mg l À1 for fresh marshes and 9.03 mg l À1 for salt marshes). The lack of NO 3 seasonal variation for S1 may be the result of regular nitrate input from a fish farm located near the w a t e r r e s e a r c h 4 5 ( 2 0 1 1 ) 4 1 5 2 e4 1 6 8 sample point (Tovar et al, 2000). The seasonality of the other groups appears to be the result of high precipitation during winter.…”

Section: Catchment Basins and Land (Soil) Usementioning

confidence: 98%

Variability of fresh- and salt-water marshes characteristics on the west coast of France: A spatio-temporal assessment

et al. 2011

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International audienceThe degradation of water quality and the multiple conflicts of interest between users make marsh restoration very important. A Water Quality Evaluation System (WQES) was developed for river systems by the European Water Framework Directive (WFD). Some form of biologically-based, habitat-specific reference standard seems absolutely essential for wise management and stewardship of marsh ecosystems. The goal of this study was to develop a statistical method to define and to characterize a water body typology for drained marshes of the Charente-Maritime wetlands on the French Atlantic coast, placing particular emphasis on environmental factors as hydraulic functioning, human activities and pedological substratum. The Charente-Maritime marshes represent a good field study because of his high diversity of types of marshes and of anthropogenic activities in a restrictive area thus erasing spatial climatic effect (latitude effect). The statistical method developed here had permitted to define and characterize 12 different water bodies, 7 in freshwater (F1 to F7) and 5 in salt water marshes for the Charente-Maritime area. This typology demonstrated an important link between the size catchment area, nitrate concentrations, and leaching of precipitation from cultured soils. Even though the Charente-Maritime marshes are strongly impacted by humans, they may still retain the ability to remove nitrate. The increasing gradient of water renewal in the freshwater marshes from F1 to F7 explained the decreasing gradient of eutrophication. A better management of the hydrodynamic of the marshes can avoid eutrophication risk on the coastal sea area. Reliance on the WFD parameter set necessarily placed limits on the kinds of interpretations that could be made and on the study's potential contribution to the basic science of marshes. Ecologically-based insights regarding both external flows (links between ecosystems, meta-ecosystem theory) and internal flows (structure of the planktonic food web) seem an essential prerequisite for further advances in the study of marsh ecosystems

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Environmental Implications of Intensive Marine Aquaculture in Earthen Ponds

Cited by 69 publications

References 11 publications

Use of Barley for the Purification of Aquaculture Wastewater in a Hydroponics System

Use of Barley for the Purification of Aquaculture Wastewater in a Hydroponics System

Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Variability of fresh- and salt-water marshes characteristics on the west coast of France: A spatio-temporal assessment

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