Inhibition of the development of microorganisms (bacteria and fungi) by extracts of marine algae from Brittany, France

The inhibitory effects of aqueous, ethanolic and dichloromethane fractions from 16 marine algae from the Atlantic shores of North-East Brittany, Franc e, have been investigated against microorganisms frequently associated with immersed surfaces. The extracts were tested in vitro against isolates of m arine fungi, bacteria and yeasts potentially involved at different stages i n the formation of biofilms in the sea. The high levels of inhibitory activ ity of nine extracts against marine fungi and Gram-positive bacteria and th eir apparent absence of toxicity against larvae of oysters and sea urchins suggests a potential for novel active ingredients.