The results revealed the marked inhibitory effect of garlic
against both P. damselae subsp. piscicida and S. iniae, and feeding garlic diet significantly conferred resistance to
challengewith P. damselae subsp. piscicida or/and S. iniae. Cobia fed garlic powder at doses of 0.5 and 1.5 g/kg b.w.
for 28 days produced significantly (p b 0.05) lower mortality after a challenge with P. damselae subsp. piscicida
and higher percent weight gain. Cobia fed garlic powder at a dose of 1.2 g/kg b.w. for 21 days and at doses of
0.4 and 1.2 g/kg b.w. for 28 days provided significant (p b 0.01) resistance against S. iniae infection. A diet
containing garlic powder at a dose of 1.2 g/kg b.w. for 28 days provided significant (p b 0.05) protection against
P. damselae subsp. piscicida plus S. iniae combined infection in cobia.