Different additives have been reported as being appropriate for improving the mechanical properties of surimi gels. Such additives have different mechanism of action associated with their beneficial effect. Velazquez et al. (2007) reported that the increase in mechanical properties of surimi by adding 0–20 g/kg of soluble protein from surimi waste water (SWW–SP) into grade FA surimi gels was associated with an increase in the water holding capacity in surimi gels. The authors indicated that the absorption of the water by the SWW–SP favored a higher protein–protein interaction, inducing a stronger gel. However, a disruptive effect was observed when SWW–SPwas added at 30–50 g/kg, decreasing both the WHC and the mechanical properties of gels. Similar effect has been reported for other additives used to improve mechanical properties (Uresti et al., 2003). In this work, fish gelatin modified significantly the WHC of the surimi gels when added at levels higher than 7.5 g/kg associated with a failure to improve the mechanical properties of gels and a negative effect when 15 g/kg of fish gelatin was added.