Table 4.

Antimicrobial activity of the three isolates against the selected fish pathogens.

Name of fish pathogen	Isolates
	GPSAK2	GPSAK4	GPSAK9
Streptococcus agalactiae	++	+++	++++
Streptococcus iniae	+	++	+
Vibrio harveyi	++	+++	++++
Vibrio alginolyticus	+++	+	+++

Values were calculated as inhibition zone diameter minus well diameter (mm). Where “+” indicates zone of inhibition between 1 and 2 mm, “++” indicates zone of inhibition between 3 and 4 mm, “+++” indicates zone of inhibition between 5 and 6 mm, and “++++” indicates zone of inhibition between 7 and 8 mm.