The Velella velella, known as “sea sailboats” or “sail jellyfish”, are marine organisms that usually generate surprise when they appear in large quantities. s on the coast. Although many people confuse them with jellyfishes, in reality they aren't exactly, but a type of colonial hydrozoans related to them.

What they are and why they draw attention

Their most distinctive feature is a small transparent sail-shaped structure that protrudes from their blue body. That “sail” allows them to move propelled by the wind over the surface of the ocean.

When they arrive to the coast, they do so in large groups, forming blue spots on the sand that can cover kilometers of beach.

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Why they are appearing in California

This phenomenon is not new, but does occur cyclically. Massive accumulations are usually related to changes in currents marine or with wind patterns that push them towards the coast. They also influence certain specific climatic conditions in the Pacific.

In years with certain oceanic conditions, it is more likely that these massive “strandings” will be recorded.

Are dangerous?

In general, they do not pose a serious risk to people. Unlike other similar species, their tentacles do not usually cause stings mean tives in humans. However, specialists recommend not touching them directly, avoiding contact with eyes or mouth and washing your hands if there was contact.

This is a precaution, as they can generate mild irritation in some cases.

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What happens when they invade the beach

When thousands of these organisms reach the shore, they rapidly accumulate in the sand. They dry in the sun and can generate odor with the passing of the days. Although the impact is visual and can affect the recreational use of the beach, it does not usually involve a serious environmental risk.