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The silky jelly is one of the fastest swimming jellies, using coordinated jet propulsion to flee danger. 🪼✨️⁠

Our observations of Colobonema in the depths of the Monterey Canyon have helped visualize that escape in finer detail. While at rest, Colobonema spreads out curly tentacles to capture food. But when threatened, the jelly’s bell rapidly contracts, and its shape quickly transforms. The rounded bell becomes almost tubular in appearance, and Colobonema’s coiled tentacles straighten and elongate. Now, a mad dash to safety begins. A single swimming burst can propel the silky jelly more than five body lengths forward.⁠

As they make a quick exit, they drop sticky tentacles to confuse potential predators. We have seen silky jellies with tentacles of varying, uneven lengths. This suggests that Colobonema can grow back their lost tentacles.⁠

We have recorded an extensive archive of deep-sea video that offers insight into more than just animal behavior. Our researchers use this trove of data to understand long-term trends in populations of midwater animals. Comparing thousands of observations of deep-sea jellies reveals how their populations ebb and flow over time.

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