The Pacific oyster, Crassostrea gigas , shows negative correlation to naturally elevated carbon dioxide levels: Implications for near‐term ocean acidification effects

We report results from an oyster hatchery on the Oregon coast, where intake waters experienced variable carbonate chemistry (aragonite saturation state 3.2; pH 8.2) in the early summer of 2009. Both larval production and midstage growth (∼ 120 to ∼ 150 µm) of the oyster Crassostrea gigas were significantly negatively correlated with the aragonite saturation state of waters in which larval oysters were spawned and reared for the first 48 h of life. The effects of the initial spawning conditions did not have a significant effect on early‐stage growth (growth from D‐hinge stage to ∼ 120 µm), suggesting a delayed effect of water chemistry on larval development.