Microalgae and Cyanobacteria, a Promising Source of Antimicrobial Molecules Against Aquatic Pathogen

Abstract

Genus Vibrio is involved in common pathologies of aquaculture fish species, being responsible for significant economic losses for that industrial activity. Microalgae and cyanobacteria have demonstrated to count on bioactive compounds able to diminish mortality and morbidity by their use as functional food supply or by addition of those bioactive compounds previously purified. The main goal of this work has been to evaluate the anti-microbian effect (growth of bacterial population measured as changes in optical density) of 25 microalgae extracts on the bacterial strain Vibrio anguillarum CECT 522T. Stock microalgae extracts were obtained from lyophilized biomass treated with methanol 99.9%. A total of thirteen extracts exhibited antibacterial activity. The highest activity corresponded to Monochrysis lutheri, followed by Hemiselmis cyclopea, Porphyridium cruentum, Tetraselmis rubens, Cryptomonas sp, Navicula sp. The anti-bacterial activity was not related to a taxonomic group, indicating species-specific or even strain-specific activity.

Interactions between Crop and Microalgae in Nutrient Utilization in Crop-microalgae Co-culture

“…Chemical control is not feasible in hydroponic systems, as chemical fungicides act on microorganisms as well as crops, so biological control is the optimal choice. Microalgae in co-cultivation systems have the potential for biocontrol, as several microalgae have been shown to have anti-fungal, anti-bacterial, and anti-viral properties [12], and this antimicrobial effect can be used to better support crop growth in cocultivation systems.…”