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Motile aeromonas infection of striped (grey) mullet Mugil cephalus
M K Soliman1, M el S Easa, M Faisal
1Department of Avian and Aquatic Animal Medicine, Faculty of Veterinary Medicine, Alexandria University, Egypt.
Abstract:
Infection of striped mullet (Mugil cephalus) with Aeromonas hydrophila results in an acute septicemic disease. The disease can be experimentally induced by intramuscular injection, skin or gill scarification or by the oral route using pellets purposely seeded with bacteria. The organism was isolated from the blood 1-2 days after infection and from all organs 24 hr or longer after infection. The disease is characterized by early inflammatory and proliferative changes and later necrotic changes. Enteritis and hepatic necrosis are constant findings in aeromonad disease of M. cephalus but surface lesions are not pathognomic for these infections in mullet. Death of infected fish may be attributed to bacterial toxins which cause necrosis of parenchymal organs and soft tissue structure.
Insights
Aeromonas hydrophila causes acute septicemic disease in striped mullet (Mugil cephalus). Bacterial toxins lead to organ necrosis and fish death, with enteritis and hepatic necrosis being constant findings.
Area of Science:
- Aquatic animal health
- Fish pathology
- Bacteriology
Background:
- Striped mullet (Mugil cephalus) are susceptible to bacterial infections.
- Aeromonas hydrophila is a known fish pathogen.
Purpose of the Study:
- To characterize the disease caused by Aeromonas hydrophila in striped mullet.
- To identify key pathological findings and routes of infection.
Main Methods:
- Experimental induction of disease via intramuscular injection, scarification, or oral administration of Aeromonas hydrophila.
- Bacterial isolation from blood and organs at various time points post-infection.
- Histopathological examination of infected tissues.
Main Results:
- Aeromonas hydrophila was isolated from blood and organs following experimental infection.
- The disease presented with early inflammatory/proliferative changes and later necrotic changes.
- Enteritis and hepatic necrosis were consistently observed; surface lesions were not pathognomonic.
Conclusions:
- Aeromonas hydrophila infection leads to acute septicemic disease in striped mullet.
- Bacterial toxins are implicated in causing parenchymal organ and soft tissue necrosis, leading to mortality.
- Understanding these pathological mechanisms is crucial for managing Aeromonas-related diseases in aquaculture.