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I was swimming with gopro in Sardinia, Le Bombarde beach in early November and today was reviewing footage - I noticed that water is full of semitransparent whitish "pills", see pictures below. Any idea what that is, is it seasonal, has any implications to people taking a swim? Jellyfish nearby should give approx idea of the size, seems something like 1-2cm long.

strange things in the sea strange things in the sea

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Quick guess based on your low-quality photo:

Reminds me of a pyrosome, a tube/rod-shaped, free floating colonial tunicate.

According to here, Pyrosoma atlanticum is the only species found in the Mediterranean.

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Image Credit: amutti; Source: inatrualist

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Image Credit: Megan Mariposa; Source: inatrualist

See iNaturalist,National Geographic and Project Noah for images of similar body shapes.

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    $\begingroup$ Unbelievable! Can you earn the ID badge twice? $\endgroup$ Commented Jul 7, 2023 at 2:10
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    $\begingroup$ @anongoodnurse :p. thanks! I should go earn it on Outdoors.SE ha! ;) $\endgroup$ Commented Jul 7, 2023 at 2:57

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