The proposed C-800 organic acid-icing system evaluated in this work, which contained ascorbic acid, citric acid and lactic acid, proved to be an effective mixture for fish preservation due to its antimicrobial effect. The microbial and sensory results obtained in this study allowed us to conclude that this novel icing system slowed microbial growth in hake, megrim and especially angler; these results agree with a significant extension of the fish shelf life. These results may be of practical interest for improving the preservation of fish quality not only on land but also for on-board strategies. Based on the results presented in this work, a strategy for the on-board application of the C-800 organic acid-icing system is currently being applied to these and other commercially relevant fish species from the Grand Sole Bank. Moreover, this study provides a way to optimise the concentrations of ascorbic acid, citric acid and lactic acid for fish preservation purposes. This process is currently under development in our laboratories, and the potential synergistic effects among the organic acids and the diffusion of organic acids from the icing medium to the fish muscle after melting are being considered.