From the Super Mario Wiki
Aqua Lakitus are a water-dwelling equivalent to the Wall Lakitus in Super Mario World 2: Yoshi's Island. They hide underwater and throw Spiny Eggs at Yoshi. When underwater, their snorkel gear can be seen just above the surface. Yoshi can defeat an Aqua Lakitu only when it comes above the water to attack.
In Mario Kart 7, the Fishin' Lakitu referee has snorkel gear in seven water courses like an Aqua Lakitu.
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