Fig. 2

Oyster samples. Five biparental oyster families produced with broodstocks from different origins in terms of geography (Atlantic Ocean or Mediterranean Sea): O1, Logonna Daoulas (latitude: 48.335263; longitude: -4.317922); O2, Dellec (latitude: 48.353970; longitude: -4.566123); O3, Charente Maritime (latitude: 45.781741; longitude: -1.121910); O4, Vidourle (latitude: 43.553906; longitude: 4.095175); O5, pond of Thau (latitude: 43.418736; longitude: 3.622620). Oyster families were produced in hatchery, and placed for five days in natural environment in the Atlantic Ocean (latitude: 48.335263; longitude: 4.317922) at two time periods (April or July 2016). The map was modified from Wikimedia Commons (https://commons.wikimedia.org/wiki/File:France_all_regions.svg?uselang=fr), published under a Creative Commons license