A. J. DAY

A. J. S. HAWKINS

A. MAGOULAS

G. KOTOULAS

M. HÉRAL

S. BOUGRIER

Y. NACIRI-GRAVEN

Triploid oysters were induced using cytochalasin B upon retention of either the first (meiosis I 
triploids) or the second (meiosis II triploids) polar body in embryos from a single cohort derived 
from mixed parentage. Allozyme and microsatellite assays enabled the confirmation of both 
parentage and triploidy status in each oyster. Comparison of meiosis I triploids, meiosis II 
triploids and diploid siblings established that improved physiological performance in triploids was 
associated with increased allelic variation, rather than with the quantitative dosage effects of ploidy 
status. An unidentified maternal influence also interacted with genotype. Among full sibs, allelic 
variation measured as multi-locus enzyme heterozygosity accounted for up to 42% of the variance 
in physiological performance; significant positive influences were identified upon feeding rate, 
absorption efficiency, net energy balance and growth efficiency (= net energy balance ÷ energy 
absorbed). Whilst allelic variation was greater in both meiosis I and meiosis II triploids than in 
diploid siblings, both allelic variation and net energy balance were highest in triploids induced 
at meiosis I. This suggests that it may be preferable to induce triploidy by blocking meiosis 
I, rather than meiosis II as has traditionally been undertaken during commercial breeding 
programmes.</jats:p

Crossref

Genetics Research

Separate effects of triploidy, parentage and genomic 
diversity upon feeding behaviour, metabolic efficiency and 
net energy balance in the Pacific oyster <i>Crassostrea gigas</i>

Separate effects of triploidy, parentage and genomic 
diversity upon feeding behaviour, metabolic efficiency and 
net energy balance in the Pacific oyster
                    Crassostrea gigas

Separate effects of triploidy, parentage and genomic diversity upon feeding behaviour, metabolic efficiency and net energy balance in the Pacific oyster Crassostrea gigas

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