Theoretically, this process can go on indefinitely, effectively rendering the jellyfish biologically immortal,[3][6] although in practice individuals can still die. In nature, most Turritopsis dohrnii are likely to succumb to predation or disease in the medusa stage without reverting to the polyp form.[7] --WP

https://en.wikipedia.org/wiki/Turritopsis_dohrnii

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[–] 9 points 1 month ago

From memory - The longest scientists have kept an immortal jellyfish alive in captivity is 5 weeks.

Their physiology requires ocean pressure and movement

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