Effects of water viscosity upon ventilation and metabolism of a flatfish, the common sole Solea solea (L.)

• Published in: Marine Biology
• Main Authors: Couturier, Christine S., Rouault, Alice, Mckenzie, David J, Galois, Robert, Robert, Serge, Joassard, Lucette, Claireaux, Guy
• Other Authors: Centre de Recherche sur les Ecosystèmes Littoraux Anthropisés (CRELA), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement IRD : UR226-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2007
• Subjects: MARENNES-OLERON BAY; GILL VENTILATION; CRASSOSTREA-GIGAS; FISH GILLS; TEMPERATURE; HYPOXIA; FRANCE; CONSUMPTION; TELEOSTS; BEHAVIOR; [SDV]Life Sciences [q-bio]; Crassostrea gigas; Turbot
• Online Access: https://hal.archives-ouvertes.fr/halsde-00449573; https://doi.org/10.1007/s00227-007-0731-z

International audience The French Atlantic coast contains large highly productive intertidal mudflats that are colonised by juveniles of numerous flatfish species, including the common sole (Solea solea, L.). These ecosystems are also heavily exploited by the shellfish farming industry. Intensive bivalve culture is associated with substantial biodeposition (1–6 t-dw ha−1 day−1), which directly or indirectly contributes to increase exopolysaccharide (EPS) concentrations at the interface between water column and seabed. EPS are long-chain molecules organised into colloids, which influence rheological properties of water, particularly viscosity. Increased water viscosity had consequences for ventilatory activity of juvenile flatfish, whereby the minimal pressure required to ventilate the medium increases directly with EPS concentration. Moreover, the critical EPS concentration ([EPS]crit) at which water was no longer able to flow through the branchial basket ranged from almost nil to over 30 mg l−1, depending on species and size. [EPS]crit was lower in small individuals and individuals from species with high metabolic rates (turbot and plaice). These differences may depend upon gill and bucco-branchial cavity morphometrics. The ventilatory workload of sole increased with viscosity to a maximum at 2 mg EPS l−1. Viscosity might, therefore, be a limiting factor for flatfish post larvae, which colonise the intertidal mudflats, depending upon their size and species. EPS concentrations in the field can reach 15 mg l−1. A selective effect is conceivable but remains to be estimated in the field.