environment. Because shellfish such as mussels are filter feeders they concentrate toxins. It
is also well known that sometimes also small amounts of toxic algae can produce serious
shellfish poisoning. In the Adriatic Sea, dinoflagellate red tides are a recurring phenomenon,
but no shellfish poisoning has been described despite the presence of potentially toxic
species such as Alexandrium spp.(Protogonyaulax) and Dinophysis spp. In June 1989 …