Population Dynamics of Vibrio and Pseudomonas Species Isolated from Farmed Tasmanian Atlantic Salmon (Salmo salar L.): A Seasonal Study
| Autor: | Hollie Stevenson, John P. Bowman, Eva Hatje, Mohammad Katouli, Christina Neuman |
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| Rok vydání: | 2014 |
| Předmět: |
Photobacterium phosphoreum
Molecular Sequence Data Population Dynamics Salmo salar Population Soil Science Aquaculture Polymerase Chain Reaction Tasmania Microbiology Fish Diseases Pseudomonas RNA Ribosomal 16S Pseudomonas fragi Animals Pseudomonas Infections Salmo education Ecology Evolution Behavior and Systematics Vibrio education.field_of_study Ecology biology Sequence Analysis DNA biology.organism_classification 16S ribosomal RNA Random Amplified Polymorphic DNA Technique RAPD Vibrio Infections Seasons |
| Zdroj: | Microbial Ecology. 68:679-687 |
| ISSN: | 1432-184X 0095-3628 |
| DOI: | 10.1007/s00248-014-0462-x |
| Popis: | Vibrio and Pseudomonas species have been shown to be part of the normal microbiota of Atlantic salmon (Salmo salar L.), with some strains causing disease in fish. The factors affecting their prevalence and persistence in the salmon gut, however, have not been well studied. In this study, we collected 340 Vibrio and 150 Pseudomonas isolates from the hindgut of farmed Tasmanian Atlantic salmon, fed with two commercially available diets. Samples were collected every 6-8 weeks between July 2011 and May 2012. Isolates from selective agar were initially identified using biochemical tests and confirmed using genus-specific primers and 16S ribosomal RNA (16S rRNA) sequencing. Random amplified polymorphic DNA (RAPD) PCR was used to type both Pseudomonas and Vibrio; the latter was further typed using a biochemical fingerprinting method (PhP-RV plates). We observed low species diversity with strains comprising Vibrio ichthyoenteri/Vibrio scophthalmi, Vibrio crassostreae/Vibrio splendidus, Aliivibrio finisterrensis, Photobacterium phosphoreum and Pseudomonas fragi. Out of 340 Vibrio isolates, 238 (70 %) belonged to 21 clonal types and were found predominantly during summer when water temperatures reached 15 to 21 °C. Of these, the four major clonal types were found in multiple samples (70 %). P. fragi, on the other hand, was only found during the colder water temperatures and belonged to 18 clonal types. The presence of both groups of bacteria and their clonal types were independent of the fish diets used, suggesting that the water temperature was the main factor of the prevalence and persistence of these bacteria in the gut of Atlantic salmon. |
| Databáze: | OpenAIRE |
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