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Nutrient levels in experimental tanks supplied with prawn pond effluent: the effect of artificial substrate and different densities of the banana prawn Penaeus merguiensis (de Man)

Palmer, P.J. and Erler, D. and Morrison, C. and Rutherford, B.W. (2005) Nutrient levels in experimental tanks supplied with prawn pond effluent: the effect of artificial substrate and different densities of the banana prawn Penaeus merguiensis (de Man). In: Project Report No. QO04018. Wastewater remediation options for prawn farms - Aquaculture Industry Development Initiative 2002-04. Department of Primary Industries and Fisheries, pp. 25-39.

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Article URL: http://era.deedi.qld.gov.au/2080/

Abstract

To experimentally investigate the effect of vertical artificial substrate and different densities of the banana prawn Penaeus (Fenneropenaeus) merguiensis on nutrient levels in prawn pond effluent, a time series experiment was conducted in a replicated tank system supplied periodically with discharge from a prawn production pond. Few differences (P>0.05) were detected between tanks without prawns, and tanks with low densities (5 prawns in 1700 litres) of prawns (10-12 g), in terms of nitrogen and phosphorus in the water column over the 28-day experimental period. Higher densities of prawns (starting at 25 or 50 per tank) caused an elevation of these macronutrients in the water column. This was partly due to prawn biomass losses from mortalities and weight reductions in the tank system. The survival and condition of prawns was significantly (P<0.05) reduced in tanks at these higher densities. The presence of artificial substrate (2 m2 tank-1) did not affect (P>0.05) the levels of nutrients in tank water columns, but significantly (P<0.05) increased the amount of nitrogen in tank residues left at the end of the trial when no prawns were present. The prawns had obviously been grazing on surfaces inside the tanks, and their swimming actions appeared to keep light particulate matter in suspension. Higher prawn densities increased microalgal blooms, which presumably kept ammonia levels low, and it is suggested that this association may provide the means for improved remediation of prawn farm effluent in the future.

Item Type:Book Section
Corporate Creators:QPIF, Agri-Science, Department of Employment, Economic Development and Innovation (DEEDI), Fisheries and Aquaculture
Business groups:Agri-Science, Fisheries and Aquaculture
Additional Information:© The State of Queensland (Department of Employment, Economic Development and Innovation). © The State of Queensland, Department of Primary Industries 2005. Copyright protects this publication. Except for purposes permitted by the Copyright Act 1968, reproduction by whatever means is prohibited without prior written permission of the Department of Employment, Economic Development and Innovation. Enquiries should be directed to Commercialisation Unit: http://www.dpi.qld.gov.au/77.htm . Email: SAFTRSCopyright@deedi.qld.gov.au . Phone: the Business Information Centre on 13 25 23 (Queensland residents) or +61 7 3404 6999. Published electronically August 2011.
Keywords:Banana prawns; artificial substrate; prawn farm wastewater; nutrients.
Subjects:Aquaculture and Fisheries > Aquaculture > Mariculture
Science > Science (General)
Deposited On:04 Aug 2011 05:27
Last Modified:08 Jun 2015 15:57

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