Head to head
Sea Nettle vs Cannonball Jellyfish
A sea nettle and a cannonball jellyfish share the same stretch of Atlantic and Gulf coast waters, and both can turn up in genuinely large numbers during summer months, yet a swimmer's experience with each is about as different as two jellyfish encounters can be.
| Sea Nettle | Cannonball Jellyfish | |
|---|---|---|
| Scientific name | Chrysaora quinquecirrha | Stomolophus meleagris |
| Sting intensity | Genuinely painful | Comparatively mild |
| Tentacles | Long and thin | Short, stubby oral arms only |
| Bell shape | Golden-brown with reddish stripes | Smooth, round, cannonball-shaped |
| Commercial use | Not commercially harvested | Harvested for food and research |
| Key predator | Various fish and sea turtles | Leatherback sea turtles |
| Seasonal abundance | Can become locally overwhelming | Often locally abundant |
| Conservation status | Least Concern | Least Concern |
Sea Nettle vs Cannonball Jellyfish: common questions
Which jellyfish is more dangerous to swimmers, the sea nettle or the cannonball jellyfish?
The sea nettle is considerably more likely to cause a swimmer discomfort, since its long, thin tentacles deliver a genuinely painful sting, while the cannonball jellyfish's short, stubby oral arms produce a comparatively mild sting that most swimmers barely notice, even though both species can appear in large numbers in the same coastal waters.
Do both of these jellyfish get eaten by leatherback sea turtles?
The cannonball jellyfish is specifically documented as a critical food source for leatherback sea turtles, which rely heavily on jellyfish generally, and while sea nettles are also consumed by various predators including some sea turtles, the cannonball jellyfish's mild sting and smooth body likely make it a particularly manageable and important prey item.
Why is the cannonball jellyfish harvested commercially but not the sea nettle?
The cannonball jellyfish's firmer, rounder body and comparatively mild sting make it more practical to harvest, process, and export to food markets, particularly in parts of Asia, while the sea nettle's long, more fragile, and more painfully stinging tentacles make it a far less practical target for commercial harvest.