Ecology of the reproduction of the cupped oyster on the french atlantic coasts
type: Dataset
description: Spat collecting supplies numerous oyster-farmers with young cupped oyster, C. gigas.Since the end of the nineties, professionals have noticed an increasing variability of the number of spat among years. This thesis aimed to identify the origin of the variability of oyster recruitment. This question is addressed by different methods for each step of the reproduction of oyster: a DEB model for gametogenesis, valvometry for spawning, cohort analysis for larvalstage and hydrodynamic models for dispersion.At the stage of the gametogenesis, variations of fecundity appear to be mainly influenced by phytoplankton quality. The study of spawning shows that it happens during high tides of springtides, leading to a spawning that is foreseeable. For Arcachon Bay, spat number depends on the survival of larval cohort that is in turn submitted to a complex climatic effect mainly based on sea temperature. Arcachon and Marennes-Oléron Bays seem also to depend on the variability of larval supply: the supply of larvae is provide by a source of larvae in the north of spat collecting areas for Charente and by an local source that seems to decrease for Arcachon. This decreaseof larval supply and the climate effect are the two suspected origins of the increased variabilityof spat collecting in Arcachon Bay.
identifier: NNT: 2011LAROS330
issued: 2026-05-21T19:47:30.284139
language: fr
modified: 2026-05-21T19:47:30.284144
contact point: Organization
  fn: CCSD
keyword: c-gigas
keyword: climate-effect
keyword: cohortes-larvaires
keyword: effet-climatique
keyword: infoeu-reposemanticsdoctoralthesis
keyword: larval-cohort
keyword: recruitment
keyword: recrutement
keyword: sdvsalife-sciences-q-bioagricultural-sciences
keyword: stock
keyword: theses
landing page: https://theses.hal.science/tel-00688131

Ecology of the reproduction of the cupped oyster on the french atlantic coasts
type: Distribution
format: HTML
issued: 2026-05-21T19:47:30.290959
modified: 2026-05-21T19:47:30.252635
access URL: https://theses.hal.science/tel-00688131

test_moissonnage_selune
type: Agent