On 2024-04-29, Robert Tomasik <r...@g...pl> wrote:
> Wątpię, by ktoś ryby badał.

Człowieku małej wiary, zarzuć Google fish cavitation a wychodzą tego stada.
Pierwsze z brzegu:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2607394
/

Physical limits on swimming speed of lunate tail propelled aquatic
animals are proposed. A hydrodynamic analysis, applying experimental
data wherever possible, is used to show that small swimmers (roughly
less than a metre long) are limited by the available power, while larger
swimmers at a few metres below the water surface are limited by
cavitation. Depending on the caudal fin cross-section, 10-15 m s-1 is
shown to be the maximum cavitation-free velocity for all swimmers at a
shallow depth.

Modele, równania, co dusza zapragnie.

W angielskojęzycznej Wikipedii jest nawet paragraf:
https://en.wikipedia.org/wiki/Cavitation

Marine life
Just as cavitation bubbles form on a fast-spinning boat propeller, they
may also form on the tails and fins of aquatic animals. This primarily
occurs near the surface of the ocean, where the ambient water pressure
is low.
Cavitation may limit the maximum swimming speed of powerful swimming
animals like dolphins and tuna.[55] Dolphins may have to restrict their
speed because collapsing cavitation bubbles on their tail are painful.
Tuna have bony fins without nerve endings and do not feel pain from
cavitation. They are slowed down when cavitation bubbles create a vapor
film around their fins. Lesions have been found on tuna that are
consistent with cavitation damage.[56]
Some sea animals have found ways to use cavitation to their advantage
when hunting prey. The pistol shrimp snaps a specialized claw to create
cavitation, which can kill small fish. The mantis shrimp (of the smasher
variety) uses cavitation as well in order to stun, smash open, or kill
the shellfish that it feasts upon.[57]
Thresher sharks use 'tail slaps' to debilitate their small fish prey and
cavitation bubbles have been seen rising from the apex of the tail
arc.[58][59]

--
Marcin