Negative correlation between aneuploidy and growth in the Pacific oyster, Crassostrea gigas: ten years of evidence

• Published in: Aquaculture
• Main Authors: Leitao, A, Boudry, P, Thiriot-Quievreux, C
• Other Authors: Inconnu, Laboratoire d'océanographie de Villefranche (LOV), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2001
• Subjects: [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography; Pacific; Crassostrea gigas; Pacific oyster
• Online Access: https://hal.archives-ouvertes.fr/hal-03483065; https://doi.org/10.1016/S0044-8486(00)00488-9

This study unites previous and new observations that chromosome loss in somatic cells of juveniles of the Pacific oyster Crassostrea gigas is associated with reduced growth rate. New data were obtained from four hatchery-produced progenies. Within each progeny, oysters of identical age were sampled and classified as fast-growing or slow-growing according to their shell length, or live weight. Chromosome numbers were individually scored from 30 randomly chosen metaphases from gill tissue. Although the diploid chromosome number in C. gigas is 2N = 20, hypodiploid cells of 2N = 19, 18 or 17 were observed in all progenies. The difference in percentage of aneuploidy between fast- and slow-growing oysters ranged from 5% to 22% and was highly significant. In one progeny, a highly significant negative correlation (R-2 = 0.58) was observed between individual level of aneuploidy and growth performances individually recorded under common controlled conditions. The consistency of the negative relationship between growth rate and aneuploidy was obvious in all populations studied between 1988 and 1999. However, when comparing aneuploidy between fast- and slow-growing oysters, two different groups of populations can be clearly distinguished. The question remains to determine the cause of these differences. (C) 2001 Elsevier Science B.V. All rights reserved.