New perspective to control of tenacibaculosis in sea bass Dicentrarchus labrax L |
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| Authors: | Riad H Khalil Amany M Diab Medhat S Shakweer Hanan A Ghetas Mohammed M Khallaf Amira AE‐D Omar |
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| Affiliation: | 1. Department of Poultry and Fish Diseases, Faculty of Veterinary Medicine, Alexandria University, Alexandria, Egypt;2. Aquatic Microbiology, Faculty of Aquatic and Fisheries Sciences, Kafrelsheikh University, Kafr Elsheikh, Egypt;3. Department of Fish Diseases and Management, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt;4. Department of Aquatic Animal Medicine and Management Department, Faculty of Veterinary Medicine, Sadat City University, Sadat, Egypt;5. Department of Fish Diseases and Management, Faculty of Veterinary Medicine, Kafr El‐Sheikh University, Kafr El‐Sheikh, Egypt |
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| Abstract: | This work was carried out to investigate the effects of injection of Tenacibaculum maritimum formalin‐killed cells (FKC), extracellular products (ECPs) and crude lipopolysaccharide (LPS) as well as 1% feed supplements of oil extracts of Echinacea purpurea and Origanum vulgare on sea bass immunity improvement to the favour of T. maritimum experimental infection control after 4 weeks of the experiment. Tenacibaculum maritimum isolated from naturally infected sea bass showed brown to yellowish‐brown lesions (sores) on gills, skin and/or fins and identified by different biochemical methods and polymerase chain reaction technique. Immune parameters namely, total protein, globulin and lysozyme activity, as well as the relative level of protection were improved by T. maritimum (FKC), (LPS), (ECPs), O. vulgare and E. purpurea, respectively compared with control. Histopathological examination of T. maritimum naturally infected sea bass indicated many pathological changes in gill, skin and musculatures. Present study could be concluded that application of T. maritimum (FKC), (LPS), (ECPs), O. vulgare or E. purpurea improved sea bass immunity to the favour of disease resistance against T. maritimum. Further investigations on the combination between the previous control methods and the vaccine application methods will be needed. |
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| Keywords: |
Echinacea purpurea
immune parameters
Origanum vulgare
relative level of protection sea bass
Tenacibaculum maritimum
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