Abstract
The development to the veliger stage of fertilised ova of the Pacific oyster, Crassostrea gigas, was compared in raw natural sea water and in sea water pre-treated with various substances. Significantly higher veliger yields were obtained when the water was pre-treated with 1 mg l −1 EDTA. Combinations of EDTA and 20 mg l −1 sodium metasilicate, or 20 mg l −1 alumina, or 50 mg l −1 magnesium trisilicate or 150 mg l −1 Fuller's earth also enhanced development.
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