Assertion: oyster | /r/HasProperty | maintained in 25 µm filtered water
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text: ; cupping of the left valve; reduced condition index; mantle retraction & abnormal proteinaceous material (conchiolin) deposits around periphery of mantle on inner shell surface: dying oysters may also display unequal shell growth, with the left valve outgrowing the right valve, & tissue emaciation; can decimate cultured seed No known preventative measures; can be ameliorated by growing seed past 30 mm as quickly as possible by spawning adults earlier in season, increasing water flow over young spat, & providing food & temperatures that enhance growth; alternatively, spawning adults late in the season also helps; mortality can be reduced or eliminated when oysters are maintained in 25 µm filtered water diluted with high salinity well water; reducing stocking densities within growing trays also improves survival MSX (Multinucleate Sphere X) disease; Haplosporidiosis; Delaware Bay disease Haplosporidium nelsoni .