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Metabolic rate of blue mussels (Mytilusedulis) under varying post-harvest holding conditions

Published online by Cambridge University Press:  29 April 2013

Sara Barrento*
Affiliation:
Centre for Sustainable Aquaculture Research, Swansea University, SA2 8PP, Swansea, UK CIMAR/CIIMAR, Interdisciplinary Centre for Marine and Environmental Research, University of Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal
Ingrid Lupatsch
Affiliation:
Centre for Sustainable Aquaculture Research, Swansea University, SA2 8PP, Swansea, UK
Alex Keay
Affiliation:
Centre for Sustainable Aquaculture Research, Swansea University, SA2 8PP, Swansea, UK
Gyda Christophersen
Affiliation:
The National Institute of Technology, P.O. Box 141 Økern, NO-0509 Oslo, Norway
*
a Corresponding author:[email protected]
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Abstract

The mussel (Mytilus edulis) is successfully grown in aquaculture inEurope. Mussels are usually sold live and wet storage is becoming more common. In thisstudy, oxygen demand and ammonia excretion were assessed at increasing water temperaturesand different post-harvest situations. This information was used to calculate minimal flowrates per unit biomass of live mussels sufficient to keep oxygen above 5 mg L-1or 50% saturation, and avoid accumulation of ammonia in commercial wet storage. In thisstudy, rope-grown mussels were kept out of water for 8 h to simulate harvesting conditionsand then re-immersed in holding tanks at 5, 10 and 15 °C. Oxygen and ammoniaconcentrations were measured immediately after mussels were re-immersed (0 h), after 6 hand then every day for 3 days. After this period, the mussels were again kept out of waterfor 48 h to simulate long-distance transport and once again re-immersed for the sameperiod as before. In the first 6 h after re-immersion, the oxygen consumption was between7.5 and 12.2 μmol g-1 h-1 (dry flesh) and afterthis period it decreased to a standard level of around 4.0 ± 0.9 μmolg-1 h-1 and was independent of temperature. There were no majordifferences in oxygen consumption between mussels having spent 8 and 48 h out of water atany of the subsequent water temperatures used for re-immersion. In contrast, the ammoniaexcretion showed greater differences according to temperature and time out of water.Ammonia excretion was lowest at 5 °C (<0.01 μmol g-1h-1). The implications of these results for the industry and authorities arediscussed considering the water flow rate, depuration specifications and energy costs.

Type
Research Article
Copyright
© EDP Sciences, IFREMER, IRD 2013

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