Probiotic Strains for Disease Management in Hatchery Larviculture of the Eastern Oyster Crassostrea virginica

Document Type


Date of Original Version



Bacterial pathogens are a major cause of mortality in bivalve hatcheries, and outbreaks can result in shortages of seed supply to the grow-out industry. The use of probiotic bacteria is a potential preventative measure to limit the impact of bacterial diseases. Previous research showed that the marine bacteria Phaeobacter inhibens S4 (S4) and Bacillus pumilus RI06-95 (RI) protect larval eastern oysters (Crassostrea virginica) when challenged with the pathogens Vibrio tubiashii RE22 (now Vibrio coralliilyticus RE22) and Roseovarius crassostreae CV919-312T. In this study, these probiotic bacteria were tested under hatchery conditions. Daily addition of S4 and RI (104 colony forming units (CFU)/ml) to 100-l culture tanks resulted in a significant decrease in the levels of total Vibrios in water and tank surfaces (P < 0.05), but not in oysters. Larval growth and survival was unaffected by the probiotic treatments. Larvae treated with probiotics in the hatchery showed significantly less mortality than larvae from control tanks when exposed to 105 CFU/ml of V. coralliilyticus RE22 for 24 h in a laboratory challenge. These results suggest that S4 and RI are safe and potentially effective tools to limit disease outbreaks in oyster hatcheries.

Publication Title, e.g., Journal

Journal of Shellfish Research






Saebom Sohn, Murni Karim and Mart Gomez-Chiarri are affiliated with the Department of Fisheries, Animal and Veterinary Sciences.

David R. Nelson is affiliated with the Department of Cell and Molecular Biology.

David C. Rowley is affiliated with the Department of Biomedical and Pharmaceutical Sciences.