Virginia Institute of Marine Science
Journal of Shellfish Research
Slate was investigated as a substitute for oyster shells which are used as a substrate for oyster spat (Crassostrea virginica) settlement in James River, Virginia oyster repletion programs. Oyster shells and slate fragments were planted on adjacent plots in two submerged locations about 825 m apart in July 1984. Quantitative .093 m2 (one ft2) samples were collected by a diver on seven occasions through July 1985, with additional samples collected from teh natural oyster bottoms adjacent to the two areas. Percent mortality, growth and numbers of live spat and spat scars (dead spat) per unit area of bottom were determined. As the end of the study, the number of spat on shell was 4-5 times higher than on slate; however, slate had 5-6 times more spat per unit area of bottom than the shell on the natural bottom. During the July to October setting season mortalities were much higher on slate than on shell; during the remaining period they were high but about equal on both substances.
Oysters -- Larvae -- Virginia -- James River
Haven, D. S.; Zeigler, J. M.; Dealteris, J. T.; and Whitcomb, J. P., Comparative attachment, growth and mortalities of oyster (Crassostrea virginica) spat on slate and oyster shell in the James River, Virginia (1987). Journal of Shellfish Research, 6(2), 45-46.