Lactococcus lactis subspecies lactis isolate WFLU-12 and use thereof

A method of providing to a fish at least one effect selected from enhancing innate immune response, increasing body weight, increasing body length, enhancing lipid metabolism-related substances and carbon metabolic intermediates, maintaining body circulating metabolites, enhancing body citrulline level, maintaining homeostasis of metabolites, increasing the expression level of N-acetyl methionine, methionine sulfoxide, cysteine sulfonic acid, cysteic acid, increasing the level of taurine and bile acid in intestine, and enhancing the level of B1, B2, B3 and C vitamins in the fish comprising administering to the fish a probiotic composition comprising the Lactococcus lactis subspecies lactis isolate WFLU-12 deposited under the accession number KCTC13180BP or a culture thereof, wherein the increase or the enhancement is when compared to a corresponding fish not administered with the probiotic composition.

A method of promoting growth of a fish comprising administering to the fish an antibacterial composition comprising the Lactococcus lactis subspecies lactis isolate WFLU-12 deposited under the accession number KCTC13180BP or a culture thereof.

A method of inhibiting the infecting activity of a bacterial pathogen in a fish comprising spraying the fish with an antibacterial composition comprising the Lactococcus lactis subspecies lactis isolate WFLU-12 deposited under the accession number KCTC13180BP or a culture thereof.