and H2S-producer organisms. In the present experiment,
the films contain glycerol in their formulation. The potential
decrease in water activity of the film surface due to the presence of
glycerol (and then in the fish surface) is not considered essential in
reducing microorganisms, because the microbial reduction is much
lower or even insignificant on films that do not contain tea (with or
without bacteria) (Fig. 1).