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Abstract

A 3D ecosystem model was used to quantify changes in water quality brought about by salmon aquaculture inthe D'Entrecasteaux Channel and Huon Estuary in southeast Tasmania. Macroalgae-based integrated multitrophicaquaculture (IMTA) was simulated and showed that IMTA is capable of reducing the increased chlorophyllconcentration attributable to fish farming by up to 10–15% in large areas of the region, during the seasonof highest production. Kelp farms (Macrocystis pyrifera) recovered between 6 and 11% of the dissolved inorganicnitrogen (DIN) input by salmon aquaculture over a nine month period, with DIN remediation increasing linearlywith farm size. Under a ten-fold increase in aquaculture to very high loads, a much lower remediation effect wasfound for both chlorophyll and DIN. Model results indicate that IMTA could have an important impact onreducing negative effects of finfish aquaculture on water quality providing that stocking rates are not too high.

Item Type:	Article
Authors/Creators:	Hadley, S and Wild-Allen, K and Johnson, C and Macleod, C
Keywords:	bioremediation, macrocystis, salmon aquaculture, biogeochemical model
Journal or Publication Title:	Marine Pollution Bulletin
Publisher:	Pergamon-Elsevier Science Ltd
ISSN:	0025-326X
DOI / ID Number:	https://doi.org/10.1016/j.marpolbul.2018.05.045
Copyright Information:	Crown Copyright © 2018 Published by Elsevier Ltd. All rights reserved.
Related URLs:	Google Scholar: Johnson, C UTAS Profile: Johnson, C Google Scholar: Macleod, C UTAS Profile: Macleod, C
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