Storage of Pacific oysters Crassostrea gigas in recirculating tank: ammonia excretion and potential nitrification rates

Type Article
Date 2015-01
Language English
Author(s) Buzin Florence1, 2, Dupuy Beatrice1, Lefebvre Sebastien3, Barille Laurent2, Haure Joel4
Affiliation(s) 1 : IFREMER, Laboratoire Sécurisation des Productions en Conchyliculture Polder des Champs, Pont n̊ 7, 85230 Bouin, France
2 : LUNAM Université, Université de Nantes, Mer Molécules Santé EA 2160, Faculté des Sciences et des Techniques, BP 92208, 2 rue de la Houssinière, Nantes F-44322, France
3 : Université de Lille 1 Sciences et Technologies, CNRS, UMR 8187 Laboratoire d’Océanographie et de Géoscience, Wimereux Marine Station, 28 av. Foch, Wimereux F-62930, France
4 : IFREMER, Laboratoire de Génétique et Pathologie des Mollusques Marins, Station de la Tremblade - Ronce Les Bains - La Tremblade F-17390, France
Source Aquacultural Engineering (0144-8609) (Elsevier), 2015-01 , Vol. 64 , P. 8-14
DOI 10.1016/j.aquaeng.2014.11.007
WOS© Times Cited 11
Keyword(s) Crassostrea gigas, Ammonia excretion, Nitrification rate, Recirculating system, Temperature
Abstract In response to the closure of shellfish production sites due to increasing occurrence of toxic algal blooms, land-based recirculating aquaculture systems (RAS) could be used by producers to store a proportion of their stock temporarily. An RAS prototype was tested in this study to store Pacific oyster Crassostrea gigas over a range of temperatures. In such systems, the water temperature is a variable that could influence the bivalve excretion rate of ammonia, the concentration of which may become critical for the water quality. In this study, we first estimated the total ammonia nitrogen (TAN, N-NH4+ + N-NH3) excretion of the Pacific oyster and then investigated whether the bacterial population associated with the oysters could act as a natural biofilter by measuring the potential nitrification rate (PNR) of the shell. The TAN excretion rate varied significantly with temperature. The PNRs were significantly different depending on the shell surface considered with a PNR of 0.42 ± 0.11 (SD) nmol N cm−2 h−1 for the internal part, 0.96 ± 0.15 (SD) nmol N cm−2 h−1 for the external part of the shell. In addition, a 5-week experiment was conducted with a 180 kg of oyster stock stored in a 1900 L RAS to monitor TAN concentration and to establish a TAN budget at the level of an oyster population. The TAN concentration sharply declined in the RAS after 6 days and a stable concentration of 3.3 ± 0.91 (SD) μmol N L−1 was reached till the end of the experiment. This measurement, as well as the estimation of a theoretical TAN budget based on the previous experiments, showed that the PNR and some other associated processes were sufficient to counteract the ammonia fluxes excreted by the oysters. This result underlines the significant role played by the nitrifying bacterial population colonizing the bivalve shell and suggests that such an oyster stock could be stored in a recirculating tank without the addition of a biofilter, which would represent a real economic advantage.
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