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Modeling the depuration potential of blue mussels (Mytilus spp.) in response to thermal shock

Cusson Mathieu, Tremblay Réjean, Daigle Gaétan et Roussy Marcel. (2005). Modeling the depuration potential of blue mussels (Mytilus spp.) in response to thermal shock. Aquaculture, 250, (1-2), p. 183-193.

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URL officielle: http://dx.doi.org/doi:10.1016/j.aquaculture.2005.0...

Résumé

When contaminated, most molluscs destined for human consumption require a depuration regime lasting 48 h at a minimum temperature of 5 °C to ensure elimination of coliforms. However, this regime is unsatisfactory in northern temperate regions, where temperatures are frequently below 5 °C. A series of tests were undertaken to determine the filtration activity of mussels (Mytilus spp.) under cold temperatures. We used physiological measures rather than the more traditional method of bacterial analysis to evaluate mussel acclimation to cold temperatures. Mussels were acclimated for 4 weeks at three different temperatures (8, 4, and − 1 °C) and their scope for growth was evaluated each week to determine the level of acclimation. Mussels were then exposed to a thermal shock and clearance rates were measured after 2 h and 72 h. We observed a clearance rate of 2.45 l h− 1 g− 1 (g DW) for the 8 °C control group. Thus, within a 48-h depuration period, Mytilus spp. could filter a standard volume of 117.47 l. We used a von Bertalanffy exponential model to estimate the time required for an individual from each thermal shock treatment to filter that standard volume. We found that thermal shock had an important effect on the volume filtered by a mussel in 48 h. For example, mussels acclimated at 8 °C were able to filter the standard volume of 117.47 l in an average of 75 h at 4 °C, whereas those acclimated at 4 °C and transferred to 8 °C required only 23 h on average.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:250
Numéro:1-2
Pages:p. 183-193
Version évaluée par les pairs:Oui
Date:2005
Sujets:Sciences naturelles et génie > Sciences appliquées > Océanographie
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:clearance rate, thermal cold acclimation, depuration, mussels, mytiliculture, Mytilus spp.
Déposé le:17 mars 2016 22:21
Dernière modification:05 déc. 2016 20:52
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