AB 7:229-241 (2009)  -  DOI: https://doi.org/10.3354/ab00190

Reproductive effort and growth in Crassostrea gigas: comparison of young diploid and triploid oysters issued from natural crosses or chemical induction

Julien Normand1, Bruno Ernande2, Joël Haure3, Helen McCombie4, Pierre Boudry5,*

1Ifremer – Laboratoire de Génétique et Pathologie (LGP), Station de la Tremblade, Avenue du Mus du Loup,
17390 La Tremblade, France
2Ifremer – Laboratoire Ressources Halieutiques, Station de Port-en-Bessin, Avenue du Général de Gaulle, 14520 Port-en-Bessin, France
3Ifremer – Laboratoire Environnement Ressources, Polder des Champs, 85230 Bouin, France
4Experiance, Le Proscenium, 32 rue Albert Einstein, 17000 La Rochelle, France
5Ifremer – UMR 100 Physiologie et Ecophysiologie des Mollusques Marins, Technopole de Brest-Iroise, 29280 Plouzané, France
*Corresponding author. Email:

ABSTRACT: Early reproductive effort and growth were measured in 3 groups of the Pacific oyster Crassostrea gigas: 1 diploid group and 2 triploid groups resulting from either chemical induction (3nCB) or crosses between tetraploid and diploid parents (3nDT). Oysters were reared under intensive nursery conditions and sampled when 5 mo old. Reproductive effort was estimated by cross-sectional area measurements of the visceral mass (i.e. gonadic occupation) and maturation stage was assessed by qualitative histology. As expected, comparison of the reproductive patterns of these 3 groups revealed a lower reproductive effort in triploid individuals relative to diploid. However, gonadic occupation in triploid oysters was higher than expected in both 3nCB and 3nDT groups, as the gonadic occupation was 47% of that in diploids at the sampling date. Our results suggest that, despite much lower mature gamete production in triploid oysters relative to diploid, their reproductive effort can be significant, even in young individuals. Additionally, a significant relationship was observed between gender and body mass within each group and for gonadic occupation in the diploid group, suggesting that there is a link between sex and fitness-related traits in C. gigas.


KEY WORDS: Crassostrea gigas · Gametogenesis · Oyster · Triploidy


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Cite this article as: Normand J, Ernande B, Haure J, McCombie H, Boudry P (2009) Reproductive effort and growth in Crassostrea gigas: comparison of young diploid and triploid oysters issued from natural crosses or chemical induction. Aquat Biol 7:229-241. https://doi.org/10.3354/ab00190

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