There's nothing about the opah that says 'fast-moving predator.' Tuna, sharks, and swordfish are fast-moving predators and accordingly, their bodies look like streamlined torpedoes. By contrast, the opah looks like a big startled frisbee, with thin red fins stuck on as an afterthought.
Its pretty and big, but fast? But the opah is an active predator, which has a trait that no other fish possesses. It is warm-blooded. It can consistently keep its entire body around 5 degrees Celsius warmer than its environment.
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