Films and protein solubility results are shown in Fig. 1. Fish protein films immersed in water become hydrated and thicker, without visually loosing their integrity. Control films showed 34% soluble fraction, which was lower than several other values reported earlier (Artharn et al., 2007 and Shiku et al., 2004). The protein solubility of control films was within the values obtained in other studies (e.g. Benjakul et al., 2008). The incorporation of essential oils in films reduced films solubility, principally for origanum and clove films (10%), which was similar to the findings of Hosseini et al. (2009) in chitosan-based films with clove and cinnamon, but not with thyme essential oil. In contrast, protein solubility was significantly higher in films incorporated with clove, whereas statistically lower values were obtained with films with origanum.