R. Rico-Mora, D. Voltolina, J.A. Villaescusa-Celaya-1998
Aquaculture Engineering, 19(1): 1-6
Abstract:
A bacterial strain (SK-05), selected for its active growth in organic-poor substrates and inoculated in a Skeletonema costatum culture in late exponential growth, prevented the establishment of Vibrio alginolyticus, purposely introduced into the diatom culture. Since SK-05 has no bacteriostatic or antibiotic activity against V. alginolyticus, it is concluded that it has an effect of competitive exclusion, due to its ability to utilize the exudates of S. costatum, which maintain within the culture an organic-poor environment, unsuitable for Vibrio growth. It is speculated that the use of SK-05 or other strains with similar properties in commerical hatcheries, might be a viable alternative to the use of other, more expensive probiotic bacteria.
(Facultad de Ciencias Marinas, Universidad Autonoma de Baja California, AP 453, 22800 Ensenada, B.C. Mexico)