The Influences of Mg^(2+), Ca^(2+) and Mg ^(2+)/Ca ~ (2+) Ratio in Mixed Seawater on the Emergence Rate of Penaeus japonicus Postlarva

This paper reports the approprite ranges of Mg 2+, Ca 2+ and their ratio Mg 2+/Ca 2+ in mixed seawater for rearing of Penaeus japonicus larvae. The ranges for the above three indices are 1150-1450 mg/L, 360-440 mg/L and 2.8-3.4, respectively. The proper salinity range of mixed seawater is 22.1-33.8 obtained by mixing estuarine water and concentrated seawater.