Magnetic resonance imaging as a means to assess the body growth and the gonad development of the oyster Crassostrea gigas

• Published in: Aquatic Living Resources
• Main Authors: Hatt, P.J., Davenel, A., Eliat, P.A., Quellec, S.
• Other Authors: Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Technologie des équipements agroalimentaires (UR TERE), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2009
• Subjects: DEVELOPPEMENT GONADIC; IRM; HUITRE; [SDE]Environmental Sciences; Pacific; Crassostrea gigas; Pacific oyster
• Online Access: https://hal.inrae.fr/hal-02592544; https://doi.org/10.1051/alr/2009038

International audience To make a preliminary exploration of the possibilities and limits of magnetic resonance imaging (MRI) for assessing body growth and gonad development of the Pacific oyster, Crassostrea gigas, individual monitoring was conducted on diploid and triploid oysters in their second year, maintained from February to October in a pond on the French Atlantic coast. Magnetic resonance imaging was done on each oyster on five dates during the study period. From these images, variations in the volumes of the flesh, digestive glandgonad and adductor muscle, and the surface of the gills were measured over time. Apart from the well known differences between diploids and triploids related to maturation of gametes, other original observations of assessing growth were made from these MRI measurements using a non-invasive technique. The standard error of mean dry flesh variation was lower than that found by other commonly used measurement methods. A negative correlation was established between the volume of the gametes spawned and the increase in dry flesh volume after spawning. Moreover, these variations were correlated with the chemical composition of the adductor muscle. All these observations and conclusions need to be confirmed by further observations on oysters of different sizes or grown in different environments. Pour explorer les possibilités et les limites de l'imagerie en résonance magnétique (IRM) sur la croissance corporelle et le développement des gonades de l'huître, Crassostrea gigas, des suivis individuels ont été effectués sur des huîtres diploïdes et triploïdes âgées de 2 ans, élevées en bassins de février à octobre sur les côtes Atlantiques françaises. L'IRM a été effectuée sur chaque huître, à cinq dates durant la période d'étude. Les variations de volume de la chair, de la glande digestive et du muscle adducteur, et de la surface des branchies ont ainsi été mesurées. A part les différences bien connues entre huîtres diploïdes et triploïdes liées à la maturation des gamètes, d'autres ...