Hydrated cysts have far more specific tolerances with mortalities occurring below -18°C and
above +40°C; a reversible interruption of the metabolism (= viability not affected) occurring
between -18°C and +4°C and between ± 33°C and ± 40°C, with the upper and lower
temperature limits varying slightly from strain to strain. The active cyst metabolism is situated
between +4°C and ± 33°C; the hatching percentage remains constant but the nauplii hatch
earlier as the temperature is higher