Prevalence of nervous necrosis virus (NNV) and Streptococcus species in wild marine fish and crustaceans from the Levantine Basin, Mediterranean Sea
| Autor: | Ran Berzak, Aviad Scheinin, Danny Morick, Rei Diga, Dan Tchernov, Nadav Davidovich, Yael Regev |
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| Rok vydání: | 2019 |
| Předmět: |
040301 veterinary sciences
Fish farming Betanodavirus Zoology Aquaculture Aquatic Science 0403 veterinary science Fish Diseases Mediterranean sea Streptococcal Infections Mediterranean Sea Prevalence Animals Mariculture Streptococcus iniae Ecology Evolution Behavior and Systematics Trophic level Ecological niche biology Streptococcus 04 agricultural and veterinary sciences biology.organism_classification Crustacean Sea Bream 040102 fisheries 0401 agriculture forestry and fisheries |
| Zdroj: | Diseases of aquatic organisms. 133(1) |
| ISSN: | 0177-5103 |
| Popis: | Infectious diseases in marine animals have ecological, socio-economic and environmental impacts. Nervous necrosis virus (NNV) and Streptococcus iniae have become major threats to marine aquaculture and have been detected in morbid marine organisms worldwide. However, despite their importance, there is a lack of knowledge regarding the prevalence of these pathogens in wild fish species. Here we sampled indigenous and Lessepsian species from different trophic levels and different biological niches in the eastern Mediterranean. A total of 174 fish and 32 crustaceans were tested for S. iniae and a total of 195 fish and 33 crustaceans were tested for NNV. We found an overall prevalence of 9.71% Streptococcus spp. and 21.49% NNV in selected marine fish and crustaceans by PCR and qPCR. In fish, the zoonotic agent S. iniae was detected at a higher prevalence in kidney compared to liver tissue. Co-infection by both pathogens was detected only in 5 specimens. We also examined gilthead sea bream Sparus aurata from an Israeli offshore marine farm during the grow-out period, in order to assess the possibility of horizontal pathogen transmission from wild to maricultured fish. Three out of 15 (20%) fish were found to be NNV positive after 120 d in the sea, suggesting spontaneous transmission from wild to farmed fish. Our findings suggest that more surveys should be conducted, especially in areas were mariculture farms are planned to be established. |
| Databáze: | OpenAIRE |
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