Water quality parameters were within desired ranges for oyster culture ( Table1). Observed
mean concentrations of ammonia, nitrite, and nitrate were all less than 1% of the lethal concentrations reported in Epifanio and Srna (1975) .Calcium supplementation was required
to the culture water because oysters demand a high level for growth. Approximately 95%
of the shell is calcium carbonate by weight ( Yu et al.,2010). To the author’s knowledge