Journal
DISEASES OF AQUATIC ORGANISMS
Volume 53, Issue 1, Pages 25-31Publisher
INTER-RESEARCH
DOI: 10.3354/dao053025
Keywords
Vibrio; wrasse; vibriosis; taxonomy; phylogeny
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Two vibrio bacteria pathogenic to the corkwing wrasse Symphodus melops were isolated. Vibriosis-inducing strain LP1 was isolated as the dominanting bacterium in kidney samples of dead and moribund wrasse from a population suffering vibriosis and high daily mortality in 1998, on the Norwegian west coast. The other vibriosis-inducing strain, LP2, was isolated from wrasse captured the following year. Re-infection experiments have confirmed that these strains cause vibriosis in corkwing wrasse. Both strains were typical vibrios sharing the traits of fermentative Gram-neclative curved rods with motility and a positive oxidase reaction. Detailed biochemical and genetic characterisation revealed a close affiliation to known species of the marine environment. The first isolate, LP1, is a form of the ubiquitous seawater organism Vibrio splendidus, while the second isolate, LP2, is closely related to V tapetis (previously only known as the brown ring disease agent in clams). Identification of the new wrasse pathogens V splendidus LP1 and V tapetis LP2 is facilitated by break points observed in this study.
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