Table 1. Strains used in this study.

Strain	Relevant characteristics /genotype	Reference(s)
Aeromonas salmonicida ATCC33658	Type strain	ATCC strain collection
Yersinia ruckeri 392/2003		[23]
Salmonella enterica serovar Typhimurium LT2		sequenced
Lactococcus lactis IL1403		[24]
Escherichia coli ATCC25922	Clinical isolate, Serotype O6, Biotype 1, reference strain	ATCC strain collection
Staphylococcus aureus ATCC29213	reference strain for antimicrobial susceptibility testing	ATCC strain collection
Enterococcus faecalis ATCC29212	reference strain for antimicrobial susceptibility testing	ATCC strain collection
Pseudomonas aeruginosa ATCC27853	reference strain for antimicrobial susceptibility testing	ATCC strain collection
Listeria monocytogenes N22-2	Isolate from fish processing industry	[25]
Escherichia coli ATCC25922	Clinical isolate, Serotype O6, Biotype 1, reference strain	ATCC strain collection