Twenty bacterial isolates from selected marine communities were obtained employing solid, modified sea water media contain ing slops. Thirteen basic morphological, cytological, physiological and biochemical tests were conducted to characterize six of the strains that grew most successfully on the slops media. The ability to hydrolyze high molecular weight sugars and proteins appears to be a necessary condition for the successful growth of some of these isolates on slops media. Tentative identifications of these bacterial strains were made.Veinte cepas bacterianas de comunidades marinas seleccionadas se aislaron en un medio de cultivo sólido modificado que contenía agua de mar y mosto. Trece pruebas morfológicas, citológicas, fisiológicas y bioquímicas se realizaron para caracterizar seis de las cepas que crecieron mejor en el medio de cultivo con mosto. Estas cepas bacterianas han sido identificadas tentativamente.