Found thousands of these translucent blue, plastic-looking ovals washed up on the beach today. They have a stiff fin on top and blue jelly underneath. Are they dangerous?

Velella velella have a unique lifecycle that involves both asexual and sexual reproduction. The colonies we see on the ocean surface are the result of asexual budding from a single polyp that eventually gives rise to a full colony.

These colonies then release their medusae, which are small jellyfish-like forms, into the water. The medusae are responsible for sexual reproduction, releasing gametes into the ocean to create the next generation of Velella. This dual method of reproduction ensures their survival and adaptability across vast oceanic expanses.

While Velella velella are relatively harmless, there are similar species that can pose a danger. The Portuguese Man o’ War, for instance, is often mistaken for Velella due to its blue color and floating nature. However, the Man o’ War has long, venomous tentacles that can deliver painful and sometimes dangerous stings.

It’s important to be able to distinguish between these species. The Man o’ War is larger, with a more prominent, bladder-like float and long tentacles. When in doubt, maintain a safe distance from unknown marine organisms.