Are there box jellyfish or other dangerous jellyfish in the sea around the Seychelles?

"Box jellyfish" or "sea wasp" is also a common name for the notoriously dangerous Chironex fleckeri. Box jellyfish are among the most venomous creatures in the world. Each tentacle has about 500,000 cnidocytes, harpoon-shaped needles that inject venom into the victim. Stings from these species are extremely painful and often fatal to humans and prey animals. Their venom can kill a human in a minute.