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Aquaculture Environment Interactions

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AEI 3:81-91 (2012)  -  DOI:

Area-intensive bottom culture of blue mussels Mytilus edulis
in a micro-tidal estuary

Per Dolmer1,*, Helle Torp Christensen1, Benni Winding Hansen2, Bent Vismann

1Technical University of Denmark, National Institute of Aquatic Resources, Jægersborg Allé 1, 2920 Charlottenlund, Denmark
2Roskilde University, Department of Environmental, Social and Spatial Change, Universitetsvej 1, PO Box 260, 4000 Roskilde, Denmark
3University of Copenhagen, Department of Biology, Marine Biological Section, Strandpromenaden 5, 3000 Helsingør, Denmark

ABSTRACT: Dredge fishery for blue mussels Mytilus edulis (L.) impacts the benthic ecosystem, and substitution by area-intensive bottom culture production may reduce adverse effects on the ecosystem. Two different field studies in 2007 and 2009 tested the productivity of bottom culture of blue mussels, and whether a shift from dredging of full-grown blue mussels to production of blue mussels in bottom culture could reduce the area of impacted sea bottom. In the first study, the macrostructure of a commercial bottom culture was analysed by side scan mapping, and the growth of blue mussels was recorded on a transect from the edge to the central part of the bottom culture. In the second study, we analysed the effect of seeding density (1.5 and 3.5 kg m−2) on mussel production. The measured production was used to model the affected area when producing blue mussels in bottom culture. The macrostructure of the culture bed formed during the transplantation of mussel seed was not changed 1 yr after transplantation, indicating that transplantation supported the formation of a robust blue mussel bed. Shell growth showed no spatial variability from the edge to the central part of the commercial bottom culture, suggesting that growth was not reduced by density-dependent food limitation. The population production:biomass ratio (P/B) of the experimental bottom cultures was 1.0 and showed no significant effect of seeding density. Model simulations indicated that the impacted area was smaller when producing blue mussels in bottom culture than in a fishery of full-grown mussels if P/B was higher than 0.5.

KEY WORDS: Bottom culture · Ecosystem impact · Production:biomass · Shell growth · Mytilus edulis · Blue mussels · Transplantation

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Cite this article as: Dolmer P, Christensen HT, Hansen BW, Vismann B (2012) Area-intensive bottom culture of blue mussels Mytilus edulis
in a micro-tidal estuary. Aquacult Environ Interact 3:81-91.

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