The University of Southampton
University of Southampton Institutional Repository

The impact of hydraulic blade dredging on a benthic megafaunal community in the Clyde Sea area, Scotland.

Hauton, C., Atkinson, R.J.A. and Moore, P.G. (2003) The impact of hydraulic blade dredging on a benthic megafaunal community in the Clyde Sea area, Scotland. Journal of Sea Research, 50, (1), pp. 45-56. (doi:10.1016/S1385-1101(03)00045-5).

Record type: Article


A study was made of the impacts on a benthic megafaunal community of a hydraulic blade dredge fishing for razor clams Ensis spp. within the Clyde Sea area. Damage caused to the target species and the discard collected by the dredge as well as the fauna dislodged by the dredge but left exposed at the surface of the sea bed was quantified. The dredge contents and the dislodged fauna were dominated by the burrowing heart urchin Echinocardium cordatum, approximately 60 – 70% of which survived the fishing process intact. The next most dominant species, the target razor clam species Ensis siliqua and E. arcuatus as well as the common otter shell Lutraria lutraria, did not survive the fishing process as well as E. cordatum, with between 20 – 100% of individuals suffering severe damage in any one dredge haul. Additional experiments were conducted to quantify the reburial capacity of dredged fauna that was returned to the sea bed as discard. Approximately 85% of razor clams retained the ability to rapidly rebury into both undredged and dredged sand, as did the majority of those heart urchins Echinocardium cordatum which did not suffer aerial exposure. Individual E. cordatum which were brought to surface in the dredge collecting cage were unable to successfully rebury within three hours of being returned to the sea bed. These data were combined to produce a model of the fate of the burrowing megafauna dredged and dislodged in order to collect 10 kg of marketable razor clams.

PDF Hauton_et_al_JSEARES.pdf - Other
Restricted to Registered users only
Download (347kB)

More information

Published date: 2003


Local EPrints ID: 24125
ISSN: 1385-1101
PURE UUID: 8d30c71b-1df0-45d7-98a3-2ef4f1691f9c
ORCID for C. Hauton: ORCID iD

Catalogue record

Date deposited: 23 Mar 2006
Last modified: 17 Jul 2017 16:14

Export record



Author: C. Hauton ORCID iD
Author: R.J.A. Atkinson
Author: P.G. Moore

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.