The aim of the present study was to evaluate the antagonistic activity of a collection of 24 actinomycetes of marine sediment against wild species of Vibrio. Actinomycetes were characterized by their growth in Marine Agar and their extracellular enzymatic activity on different substrates. The antagonist activity was determined by in vitro tests against six strains of Vibrio isolated from Litopenaeus vannamei. Actinomycetes with greater antagonism were evaluated by their growth in standard ISP media and observations of microphotographs by scanning electron microscopy (SEM) techniques were done. The Vibrio strains were evaluated and identified by conventional biochemical techniques and confirmed by PCR. The results indicated that all actinomycetes showed at least some extracellular multi-enzymatic activity, predominating those that hydrolyze starch (79%). Antagonism tests indicated that 54...

El objetivo principal del presente estudio fue evaluar la actividad antagonista de una colección de 24 actinomicetos de sedimento marino frente a especies silvestres de Vibrio. Los actinomicetos fueron caracterizados por su crecimiento en Agar Marino y su actividad enzimática extracelular sobre diferentes sustratos. La actividad antagonista se evaluó mediante pruebas in vitro frente a seis cepas de Vibrio aisladas de Litopenaeus vannamei. Los actinomicetos de mayor antagonismo fueron evaluados por su crecimiento en medios estándares ISP y se hicieron observaciones de microfotografías por técnicas de microscopía electrónica de barrido (MEB). Las cepas de Vibrio fueron evaluadas e identificadas mediante técnicas bioquímicas convencionales y confirmadas por PCR. Los resultados indicaron que la totalidad de actinomicetos mostraron al menos alguna actividad multi-enzimática extrace...