THE pH TOLERANCE OF EMBRYOS AND LARVAE OF MERCENARIA MERCENARIA AND CRASSOSTREA VIRGINICA

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Abstract
Experimental cultures of Mercenaria mercenaria and crassostrea virginica were established at reach of the following pH values: 6.00, 6.25, 6.50, 6.75, 7.00, 7.50, 8.00, 8.25, 8.50, 8.75, 9.00, 9.25, and 9.50. More than 80% of the clam eggs developed into normal larvae at each pH from 7.00 to 8.75 and more than 80% of the larvae survived at each pH from 6.50 to 8.75; optimum pH ranged for growth of clam larvae was between 7.50 and 8.00. Approximately 80% or more of the oyster eggs developed normally at pH values from 6.75 to 8.75 and more than 70% of the larvae survived at values from 6.25 to 8.75. The pH range, 8.25 to 8.50, was optimum for growth of oyster larvae. In both species the percentage of eggs that developed normally, the percentage of la vae that survived, and the rate of growth of larvae all decreased drastically between pH 9.00 and 9.50.

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