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In this study, we estimated the heritability of survival at acute low salinity (< 3) by conducting two month-long low salinity exposure experiments with fifty half-sibling families. Selective breeding focusing on survival in acute low salinity conditions could expand areas suitable for aquaculture, but the genetic framework underlying this trait is currently unknown.

While these areas may hinder oyster growth, they provide a refuge from common oyster diseases. In the Maryland portion of the Chesapeake Bay, and in other coastal areas, salinity tends to be below optimal for typical aquaculture productivity, and these areas frequently experience periods of acute low salinity following heavy rain events. As aquaculture expands into previously unexploited areas, there is a need for oyster lines bred for specific environmental conditions. On the US east coast, Eastern oyster ( Crassostrea virginica) aquaculture has grown substantially over the last century.