36% in control) and became spat (1.5% vs. Following the recovery period, fewer larvae reached pediveliger stage (2.7% vs. 20% in control), reduced feeding and swimming ability, and slowed development. Feeding stressed algae to oyster larvae for 96 h increased the occurrence of deformities (>70% vs. Bacterial communities associated with the microalgae feed, rearing seawater, and the oyster larvae, were characterized and correlated with effects on oyster fitness parameters. Biological endpoints of larval performance were measured following the 96 h exposure and subsequent recovery. Intentionally ‘stressed’ (high pH) or non-stressed microalgae were fed to 11 day-old oyster larvae at two feeding rations for 96 h, followed by a recovery period. This study assessed the effects of feeding compromised microalgae to developing oyster larvae. Outbreaks of bacterial infection via microalgal feed are frequently implicated in these mortalities. The Pacific oyster Crassostrea gigas is the world’s most cultivated oyster and seed supply is heavily reliant on hatchery production where recurring mass mortality events are a major constraint. 4Institute of Marine Science, The University of Auckland, Warkworth, New Zealand.3Moana New Zealand Ltd., Nelson, New Zealand.
2Coastal and Freshwater Group, Cawthron Institute, Nelson, New Zealand.1Aquaculture Group, Cawthron Institute, Nelson, New Zealand.Julien Vignier 1*, Olivier Laroche 2, Anne Rolton 1, Pandora Wadsworth 3, Karthiga Kumanan 1, Branwen Trochel 2, Xavier Pochon 2,4 and Nick King 1
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