Abstract
Juvenile Penaeus monodon from three regions (Thailand, Tahiti and South Africa) were acclimated from sea water (33.5‰ salinity) to fresh water and waters of reduced salinity, ranging from 1.7‰ to 10‰ at different rates of salinity change. The changes were made over periods of up to 3 days and by direct transfer. Exposure to fresh water produced 100% mortality within 4 h. Young prawns (< 40 days post-metamorphosis) tolerated short acclimation periods of 6 h to 3 days and survived in low salinity water better than older animals. The exposure of prawns to dilute artificial media revealed a requirement for a complex medium containing more than one salt. An osmoregulation curve for 150-day-old laboratory reared prawns was also constructed.
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