Inhibitory activity of "Phaeobacter" strains against aquaculture pathogenic bacteria

  1. Susana Prado
  2. Jaime Montes
  3. Jesús López Romalde
  4. Juan Luis Barja Pérez
Zeitschrift:
International microbiology: official journal of the Spanish Society for Microbiology

ISSN: 1618-1905

Datum der Publikation: 2009

Ausgabe: 12

Nummer: 2

Seiten: 107-114

Art: Artikel

Andere Publikationen in: International microbiology: official journal of the Spanish Society for Microbiology

Zusammenfassung

A total of 523 bacterial strains were isolated during a 4-year period from mollusc hatcheries (flat oyster and clams) in Galicia (NW Spain). All of the strains were tested for their antibacterial activity against three larval pathogens (Vibrio anguillarum USC-72, V. neptunius PP-145.98, and Vibrio sp. PP-203). Of the isolates, 52 inhibited at least one of the target strains, and 11 inhibited all of them. The main source of active strains was oyster larvae, followed by water, tank surfaces, spat, and broodstock. Four similar strains, belonging to the genus Phaeobacter, showed the strongest activity. Strain PP-154, selected as representative of this group, displayed a wide spectrum of inhibitory activity against aquaculture pathogens, especially against members of the genus Vibrio, which is responsible for the most larval deaths. The inhibitory ability of such strain on solid medium was confirmed in seawater experiments, and the optimal conditions for antibacterial activity were established. These strains are promising probiotics for aquaculture facilities. Their potential benefit is based on the capacity to control the proliferation of a variety of aquaculture bacterial pathogens in mollusc larval cultures. [Int Microbiol 2009; 12(2):107-114]