Moreover, when a hammerhead shark spends too much time on the end of a fishing line, the fish's prognosis is grim. Of five shark species, hammerheads react the poorest to being caught, University of Miami marine biologists describe in a report published in January.
Hammerhead sharks showed the highest physical indicators of stress during capture, according to the study (watch the University of Miami's video explainer here). And based on satellite tracking data, the scientists believe up to 46 percent of hammerhead sharks didn't survive after four weeks of their release.
Catch-and-release harms hammerhead sharks, in particular, because they resist so ferociously -- they're strong swimmers, even among sharks. "They're like the Ferraris of the ocean," says Austin Gallagher, a PhD student in marine biology at the University of Miami, in the video.
At the end of the day, what's the best course of action for an angler who's snagged a hammerhead? It might not make for dramatic YouTube fare, but simply cut the line and leave the apex predator off the beach.