The Pacific oyster (Crassostrea gigas Thunberg, 1795) is a crucial species in global aquaculture; however, optimizing larval survival rates and ensuring high-quality seed production continue to pose significant challenges. Probiotics have been investigated as a potential solution throughout various stages of the production process. This study assessed strains of lactic acid bacteria (LAB) and pathogenic strains isolated from oysters. Notably, several LAB strains, particularly Lactobacillus plantarum 69Cr, demonstrated probiotic potential by inhibiting the growth of pathogens such as Vibrio proteolyticus. In Pacific oyster larvae, the L. plantarum 69Cr strain significantly improved survival, with an increase of over 80% compared to those exposed to the pathogen Staphylococcus pasteuri. These findings highlight the effectiveness of the L. plantarum 69Cr strain as a promising probiotic for protecting oyster larvae from pathogenic threats. [ABSTRACT FROM AUTHOR]

Copyright of Egyptian Journal of Aquatic Biology & Fisheries is the property of Egyptian Society for Fisheries Development & Human Health and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)