EFFECT OF MICROALGAE AND THEIR FILTRATES ON BACTERIAL ABUNDANCE IN THE REARING ENVIRONMENT OF THE BLACK SEA TURBOT
Keywords:
Black Sea turbot, microalgae, green water, antimicrobial effect, flow cytometryAbstract
The effects of five microalgal species, Chlorella vulgaris, Platymonas viridis, Dunaliella salina, Isochrysis galbana, Thalassiosira weissflogii, and their filtrates on bacterial load in rearing environment of the Black Sea turbot (Psetta maxima var maeoticus) were studied by flow cytometry. Chlorella proved to be the only species whose culture suspension and cell-free filtrate exhibited a significant bactericidal effect, while the well known antimicrobial properties of I. galbana were not revealed. Chlorella should be added to the rearing environment of the Black Sea turbot during embryonic and early larval development stages, including the yolk sac larvae, as it is able to prevent a bacterial outbreak during the transition period from endogenous to exogenous feeding.
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