THE need for speed forced tuna and certain sharks to independently evolve remarkably similar bodies.
The similarity between the body shapes and swimming techniques of tuna and shark species like the mako and great white has long been attributed to their shared lifestyle. “They prey on fast-moving fish so they have to be capable of high sustained speed and explosive bursts of speed,” says Jeanine Donley, a biomechanics expert at Scripps Institute of Oceanography in San Diego, California. Both types of fish have similar profiles, and use their tails for propulsion while their bodies stay rigid.
But this resemblance is…
