Incidence of Vibrio during dermal and systemic infections of the spotted sand bass (Paralabrax maculatofasciatus Steindachner: 1868) in captivity
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Redalyc · Ciencias Marinas
The incidence of Vibrio in dermal and internal injuries was evaluated in captive broodstock of spotted sand bass, Paralablax maculatofasciatus. During haemorragic infections the associated bacteria were isolated on thiosulfate-citrate-bile-sucrose agar (TCBS) and on Marine Agar 2216. Isolates were p...
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| Published in: | Ciencias Marinas |
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| Main Author: | |
| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Autónoma de Baja California
2002
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| Summary: | The incidence of Vibrio in dermal and internal injuries was evaluated in captive broodstock of spotted sand bass, Paralablax maculatofasciatus. During haemorragic infections the associated bacteria were isolated on thiosulfate-citrate-bile-sucrose agar (TCBS) and on Marine Agar 2216. Isolates were presumptively identified and the pathogenicity was experimentally evaluated. Vibrio alginolyticus, V. cholerae, V. fluvialis, V. parahaemolyticus, V. vulnificus and Vibrio sp. were present in external injuries. Vibrio alginolyticus was consistently predominant in dermal injuries. Clinical signs recorded during the vibriosis outbreaks included hemorrhages and petechiae on body surfaces, which were most severe at the base of the pelvic fins and in the opercular region. Hemorrhages and necrosis were observed on the fins. Affected fish became inactive and anorexic. Internally, hemorrhages in the intestine and a pale liver were observed. During experimentally induced infections, the fish inoculated with 108 cells of the strain VPb-C7 (identified as V. alginolyticus) developed clinical signs and mortality was recorded.
Se evaluó la incidencia de Vibrio en lesiones dérmicas e internas en lotes de reproductores de Paralablax maculatofasciatus mantenidos en cautiverio. Durante infecciones hemorrágicas las bacterias asociadas fueron aisladas en los medios tiosulfatocitrato- bilis-sucrosa (TCBS) y en Agar Marino 2216. Las cepas aisladas fueron identificadas de manera presuntiva y su patogenicidad fue evaluada experimentalmente. Vibrio alginolyticus, V. cholerae, V. fluvialis, V. parahaemolyticus, V. vulnificus, y Vibrio sp. estuvieron presentes en las lesiones externas. Vibrio alginolyticus fue consistentemente predominante en las lesions dérmicas. Los signos clínicos registrados durante los brotes de vibriosis incluyeron hemorragias y petequia en las superficies corporales, las cuales fueron más severas en la base de las aletas pélvicas y sobre la región opercular. Sobre las aletas se observaron hemorragias y necrosis. Los peces afectados se volvieron inactivos y anoréxicos. Internamente se observaron hemorragias sobre el intestino y el hígado pálido. Durante las infecciones inducidas experimentalmente, los peces inoculados con 108 células de la cepa VPb-C7 (identificada como V. Alginolyticus), se observo el desarrollo de signos clínicos y mortalidad. |
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