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Loch Nestor is a puffer fish enemy encountered in Super Mario World 2: Yoshi's Island, its remake Yoshi's Island: Super Mario Advance 3, and Yoshi's New Island. It only appears in stages where Yoshi must morph into a Submarine. It's the underwater counterpart of Boo Balloon, but whereas the Boo always chases the player, Loch Nestor merely retaliates if struck first. If it is hit by a torpedo, it simply grows two times larger and chases Yoshi. After it is hit three times, it explodes.
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