Author(s):

Samira Zarei, Nima Bahador, Maryam Mirbakhsh and Mohammad Khalil Pazir

Abstract: Litopenaeus vannamei shrimps are one of the important aqueous proteins resources that has successfully cultured from 1990. Some bacterial diseases like vibriosis among penaeus shrimps have affected shrimp industry. Vibrio harveyi (PTCC1755) and vibrio algynolyticus (MK641453.1) bacteria cause vibriosis in Peaeus shrimps. But over use of antibiotics led to the emergence of drug resistant strains of bacteria and nature cause to find and replace natural therapeutic sources like eucalyptus camaldulensis leafs. In this study we determined antibacterial activity of aqueous extract of eucalyptus camaldulensis against vibrio harveyi (PTCC1755) and vibrio algynolyticus (MK641453.1) bacteria tested in different salinity and temperature Results showed that the most antibacterial activity of eucalyptus camaldulensis for both vibrio harveyi (PTCC1755) and vibrio algynolyticus (MK641453.1) was Respectively in 78 ppt at 35 ºC and 60ppt at 35 ºC. According to the results, it can be concluded that the aqueous extract of eucalyptus camaldulensis can have an inhibitory effect on vibriosis with Vibrio harveyi (PTCC1755) and Vibrioalgynolyticus (MK641453.1) bacteria.

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