The effects of inbreeding on performance traits of adult Pacific oysters (Crassostrea gigas)

By F. Evans, Sean E. Matson, J. Brake, C. Langdon. 2004

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Genetic impact of gadoid culture on wild fish populations: predictions, lessons from salmonids, and possibilities for minimizing adverse effects (2006, unknown): “at relatively low levels of inbreeding ( Evans et al., 2004b ).”
Physiological bases of genetically determined variation in growth of marine invertebrate larvae: A study of growth heterosis in the bivalve Crassostrea gigas (2006, background): “Genetic analyses of similarly derived inbred and F2 hybrid populations reveal deleterious recessive mutations in natural oyster populations, consistent with evidence for inbreeding depression (Bierne et al., 1998; Launey and Hedgecock, 2001; Evans et al., 2003).”
Small effective number of parents (Nb) inferred for a naturally spawned cohort of juvenile European flat oysters Ostrea edulis (2007, background): “The associative overdominance hypothesis is now amply supported by evidence for large mutational load and inbreeding depression in marine bivalves (Bierne et al. 1998; Naciri-Graven et al. 2000; Launey and Hedgecock 2001; Evans et al. 2003 ).”
Improvements in desirable traits of the Pacific oyster, Crassostrea gigas, as a result of five generations of selection on the West Coast, USA (2016, unknown): “These values are likely too small to cause significant inbreeding depression of survival and other performance traits, based on the results of Evans et al. (2004).”