Abstract

Juvenile yabbies exposed to incrementally lowered oxygen concentrations at 23°C showed an LD₅₀ of 1.4 mg L^-1. Adult yabbies maintained nonnal respiration rates as ambient oxygen declined, until a critical concentration of 2.67 mg L^-1 was reached. Growth of juvenile yabbies in treatments that were nonnoxic (>7.0 mg L^-1), hypoxic (<2.5 mg L^-1) and diurnally fluctuating between nonnoxia and hypoxia, was followed over 63 days. Growth rates in the fluctuating treatments were not different from those in nonnoxia. Growth in the hypoxic treatment was slightly, but significantly, suppressed. Considering that aquaculture ponds generally exhibit diurnally fluctuating oxygen concentrations rather than long continued hypoxia, it is suggested that oxygen conditions in yabby aquaculture ponds may not have a strong effect on growth.

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