Giant Fish are a species of fish that are almost extinct. Most of the ones that remain of them, live in the waters surrounding the Monster Army's Base. The fish are basically huge, gigantic actually. They are very aggressive and attack everything that falls into their waters. One Giant Fish attacked the Holy Toa when they arrived through the Monster Barrier. It first attacked when Lah fell into the water but then the whole ship. It was about to crush it but Newhu discovered his mask power and the fish fell into water again. It later tried to attack again, but failed.