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Co-culturing green sea urchins, Strongylocentrotus droebachiensis, with blue mussels, Mytilus edulis, to control biofouling at an integrated multi-trophic aquaculture site

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dc.contributor.author Bartsch, Andrea
dc.date.accessioned 2011-09-02T20:12:04Z
dc.date.available 2011-09-02T20:12:04Z
dc.date.copyright 2011 en_US
dc.date.issued 2011-09-02
dc.identifier.uri http://hdl.handle.net/1828/3553
dc.description.abstract Prevention and removal of biofouling from nets and product is a huge expense in the aquaculture industry. Of the many technologies that slow the accumulation of biofouling, copper-based coatings are used most commonly as they are a relatively inexpensive and effective option. However, they can leach into the marine environment and have potentially harmful impacts on marine life. In previous studies, sea urchins have shown potential as a non-toxic alternative to control fouling. In this field study, five different stocking densities (i.e. 0, 30, 60, 90, 120 urchins net-1 or 0, 2.46, 4.91, 7.37, 9.82 urchins m-2) of green sea urchins, Strongylocentrotus droebachiensis, were randomly placed in 30 mussel predator exclusions nets (with six replicates per density treatment) in order to test the effect of urchin density on biofouling intensity and urchin/mussel growth. Mussel predator exclusion nets were chosen to house the urchins since they are necessary to protect mussels from diving ducks and sea otters on the west coast of Vancouver Island, British Columbia, Canada. The urchins provide a means of controlling biofouling as well an additional marketable crop to offset predator net expenses. After 174 days, the percent net occlusion, mussel growth, and urchin growth were quantified. Nets with urchins were significantly less fouled than those without urchins. Fouling on nets with higher stocking densities of urchins (90 and 120 urchins net-1) was significantly less than that on nets with the lowest stocking density (30 urchins net-1). Fouling was no longer significantly reduced at densities >60 urchins net-1 or 4.91 urchins m-2. While fouling was significantly reduced in the presence of urchins, it was not completely eliminated as they were only able to access the inside surface of the nets. There was no significant difference in mussel growth at the different urchin stocking densities, but urchin somatic growth and gonad growth did decline with increasing urchin stocking density. Mussels and sea urchins can be successfully co-cultured with no food inputs, but there is a trade-off between biofouling control and urchin growth. en_US
dc.language English eng
dc.language.iso en en_US
dc.subject Biofouling en_US
dc.subject Sea urchin en_US
dc.subject Mussel en_US
dc.subject Aquaculture en_US
dc.title Co-culturing green sea urchins, Strongylocentrotus droebachiensis, with blue mussels, Mytilus edulis, to control biofouling at an integrated multi-trophic aquaculture site en_US
dc.type Thesis en_US
dc.contributor.supervisor Cross, Stephen Fredrick
dc.degree.department Dept. of Geography en_US
dc.degree.level Master of Science M.Sc. en_US
dc.rights.temp Available to the World Wide Web en_US
dc.description.scholarlevel Graduate en_US


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