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Effects of shellfish farming on the benthic environment


Crawford, C and MacLeod, C and Mitchell, I, Effects of shellfish farming on the benthic environment, Aquaculture, 224, (1) pp. 117-140. ISSN 0044-8486 (2003) [Refereed Article]

DOI: doi:10.1016/S0044-8486(03)00210-2


The benthic environment under and near three shellfish farms in Tasmania, Australia, which had had a relatively high level of production over many years was investigated. Benthic samples were collected along transects which ran across the farms, generally from 100 m upstream to 100 m downstream. Sediment deposition, redox values, sediment sulphide concentrations, organic carbon content and water turbidity levels near the bottom were significantly different between the farms but not between sites outside the farm, at the boundary and sites within the farm. Video recordings at one farm showed dense coverage of fine filamentous algae and patchy bacterial mats directly under some longlines and this algae is thought to have fallen off the mussel longlines. At another farm dense beds of seagrass were observed in the videos both under trays of oysters and outside the farm. The benthic infauna did not show clear signs of organic enrichment, and neither univariate nor multivariate measures of benthic infauna were significantly different between sites inside and outside the farm, although they were different between farms. It was concluded from these results that shellfish farming is having little impact, and much less than salmon farming, on the benthic environment in Tasmania. Thus extensive monitoring of shellfish farms would appear to be not necessary. © 2003 Elsevier Science B.V. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Crawford, C (Dr Christine Crawford)
UTAS Author:MacLeod, C (Professor Catriona MacLeod)
UTAS Author:Mitchell, I (Ms Iona Mitchell)
ID Code:28538
Year Published:2003
Web of Science® Times Cited:171
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2003-08-01
Last Modified:2004-04-07

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