INSPIRING FUTURES

Modelling the environmental Impacts of suspended Mussel (Mytilus edulis L.) farming.

Chamberlain, Jon (2002) Modelling the environmental Impacts of suspended Mussel (Mytilus edulis L.) farming. PhD thesis, Edinburgh Napier University.

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    Abstract/Description

    The potential impacts of marine aquaculture operations on the environment are
    reviewed. The reported effects of suspended mussel farms on the benthic
    environment are examined and the potential impacts discussed. A framework to
    assess the impacts of suspended mussel farms is presented.
    The use of simulation models to predict the impact of fish farm wastes on the benthic
    environment is discussed and the mathematical theory supporting such models is
    presented. The applicability of these models to mussel farming is discussed and the
    data required to undertake such modelling identified.
    The effect of increased sedimentation on the macrobenthic community, physical
    structure and biogeochemistry of the surficial sediment around three suspended
    mussel farms are examined. At one site, the benthic community was subjected to bulk
    sedimentation, organic enrichment and reduced macrobenthic infaunal diversity.
    Elevated levels of organic carbon were recorded close to the farm. At the remaining
    two sites, benthic impacts were less clear and not demonstrably due to the mussel
    farms.
    The settling velocity of mussel faeces and pseudofaeces was required to enable
    modelling of particles ejected from the farm sites. An experiment was devised to
    measure this parameter.- The settling velocity of mussel faeces (~0.5 cms-I
    ) was less
    than pseudofaeces (~1 cms-I
    ). Differences in these settling velocities were attributed
    to the organic content and particle size of the excreted matter.
    The particle tracking model DEPOMOD (Cromey et at., 2000a) was used as a
    platform from which to develop a simulation model predicting the benthic impact of
    suspended mussel farms. Parameters within the model were modified to be represent
    a mussel farming scenario. Data from the three sites surveyed were applied to the
    model. Although the model results compared favourably with the field data, the
    model tended to overestimate the benthic impact as measured by the Infaunal Trophic
    Index.
    The results of the model are discussed and improvements and further experiments are
    identified.

    Item Type: Thesis (PhD)
    Uncontrolled Keywords: marine aquaculture; suspended mussel farms; benthic environment; fish farm wastes; environmental impact;
    University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
    Dewey Decimal Subjects: 500 Science > 570 Life sciences; biology > 577 Ecology > 577.7 Marine ecology
    Library of Congress Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
    Item ID: 5595
    Depositing User: Mrs Lyn Gibson
    Date Deposited: 14 Aug 2012 13:42
    Last Modified: 14 Aug 2012 13:42
    URI: http://researchrepository.napier.ac.uk/id/eprint/5595

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