Opabinia is a fish that's worth 35 coins found in Dinosaur Island and can be considered to be a little agile. It takes two slicing powers to kill, if using the Muramasa Blade. Although it's listed as a fish, the Opabinia is actually an invertebrate. Opabinia also hangs around the surface before Otoro goes fishing.
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A Haikouichthys, Arandaspis, and Opabinia under Otoro's boat.