A rapid cooling system that transforms seawater or saltwater into liquid ice. For use both onboard and onshore. The liquid slurry ice surrounds the fish, quickly cooling it down below 0°C and keeping the temperature around -0.5°C. During the whole fishing trip, landing, during transport to manufacturers and at the final consumer the fish stays at the same temperature without freezing. Therefore, the cool chain never breaks with OptimICE® rapid cooling and the fish stays fresh at all times, maintaining maximum quality.