Abstract
ABSTRACTFive kinds of artificial seawater with similar salinity, pH and osmolarity were prepared with different concentrations of calcium and magnesium ions. The five seawaters in this study are: complete seawater, calcium‐free seawater, half calcium‐free seawater, magnesium‐free seawater, and half magnesium‐free seawater.Dolphin fish (Coryphaena hippurus) spawn in captive tanks without hormone induction. Eggs with developing embryos were removed from the incubation tank prior to hatching and incubated in the media with different concentrations of calcium and magnesium. Survival and hatching percentages of embryonic eggs in different media were recorded and compared. The results showed that both calcium and magnesium are essential for normal development. Reduction or elimination of either of these ions has different effects, resulting in embryonic abnormalities and/or reduced hatching and larval survival.
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