The two most susceptible organisms were V.
anguillarum and P. anguilliseptica, which were inhibited
by extracts of 17 and 15 species, respectively. The
strongest antibacterial activities were obtained by A.
armata with inhibition zones of 19 mm against V.
anguillarum. Considerable antimicrobial activities
against V. anguillarum were presented also by Falkenbergia
rufolanosa and G. cornea (r, g, m). The MIC
values against V. anguillarum were b100 μg/ml for A.
armata and b400 μg/ml for C. rubrum, F. rufolanosa,
G. cornea and Halopitys incurvus. The MIC values of
the other extracts were N400 μg/ml. The MIC value for
oxytetracycline against V. anguillarum amounted to
0.5 μg/ml.
The growth of P. anguilliseptica was strongly
inhibited by A. armata and G. cornea (g) (27 mm).