Abstract
1. At salinities of 25 and 22.5 ppt growth of larvae of O. edulis and intensity of setting was not significantly different from that in control cultures at our normal salinity of 26-27 ppt.2. At 20 ppt growth of larvae was appreciably slower than at higher salinities and the intensity of setting was reduced.3. At 17.5 and 15 ppt larvae lived for some time and showed appreciable growth, but they all died prior to metamorphosis.4. At 12.5 ppt larvae showed no growth and by ten days after swarming they had suffered 90% or higher mortality.5. At 10 ppt all larvae died in less than four days.6. Some larvae that had been reared to setting size at a salinity of 26-27 ppt were capable of setting in salinities as low as 15 ppt.7. No normal larvae were obtained from adult oysters kept at salinities of 20 or 17.5 ppt.
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