Assessing the influence and distribution of shrimp pond effluent in a tidal mangrove creek in north-east Australia

Costanzo, SD, ODonohue, MJ and Dennison, WC (2004) Assessing the influence and distribution of shrimp pond effluent in a tidal mangrove creek in north-east Australia. Marine Pollution Bulletin, 48 2004: 514-525. doi:10.1016/j.marpolbul.2003.09.006

Author Costanzo, SD
ODonohue, MJ
Dennison, WC
Title Assessing the influence and distribution of shrimp pond effluent in a tidal mangrove creek in north-east Australia
Journal name Marine Pollution Bulletin   Check publisher's open access policy
ISSN 0025-326X
Publication date 2004
Sub-type Article (original research)
DOI 10.1016/j.marpolbul.2003.09.006
Volume 48
Issue 2004
Start page 514
End page 525
Total pages 12
Place of publication UK
Publisher Pergamon-Elsevier Science
Collection year 2004
Language eng
Subject C1
300804 Environmental Impact Assessment
770406 Integrated (ecosystem) assessment and management
Abstract Effluent from a land based shrimp farm was detected in a receiving creek as changes in physical, chemical and biological parameters. The extent and severity of these changes depended on farm operations. This assessment was conducted at three different stages of shrimp-pond maturity, including (1) when the ponds were empty, (2) full and (3) being harvested. Methods for assessing farm effluent in receiving waters included physical/chemical analyses of the water column, phytoplankton bioassays and nitrogen isotope signatures of marine flora. Comparisons were made with an adjacent creek that served as the farms intake creek and did not directly receive effluent. Physical/chemical parameters identified distinct changes in the receiving creek with respect to farm operations. Elevated water column NH4+ (18.5+/-8.0 muM) and chlorophyll a concentrations (5.5+/-1.9 mug/l) were measured when the farm was in operation, in contrast to when the farm was inactive (1.3+/-0.3 muM and 1.2+/-0.6 mug/l, respectively). At all times, physically chemical parameters at the mouth of the effluent creek, were equivalent to control values, indicating effluent was contained within the effluent-receiving creek. However, elevated delta(15)N signatures of mangroves (up to similar to8parts per thousand) and macroalgae (up to similar to5parts per thousand) indicated a broader influence of shrimp farm effluent, extending to the lower regions of the farms intake creek. Bioassays at upstream sites close to the location of farm effluent discharge indicated that phytoplankton at these sites did not respond to further nutrient additions, however downstream sites showed large growth responses. This suggested that further nutrient loading from the shrimp farm, resulting in greater nutrient dispersal, will increase the extent of phytoplankton blooms downstream from the site of effluent discharge. When shrimp ponds were empty water quality in the effluent and intake creeks was comparable. This indicated that observed elevated nutrient and phytoplankton concentrations were directly attributable to farm operations. (C) 2003 Elsevier Ltd. All rights reserved.
Keyword Environmental Sciences
Marine & Freshwater Biology
Nitrogen Isotopes
Water Quality
Mekong Delta
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2005 Higher Education Research Data Collection
National Research Centre for Environmental Toxicology Publications
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Citation counts: TR Web of Science Citation Count  Cited 59 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 03:02:03 EST