Could that fish-dinosaurs ring portray prehistoric piranhas?

"Reconstruction of what the Xiphodracon could have looked like. Credit: Bob Nicholls" (ScitechDaily, New 190-Million-Year-Old “Sword Dragon” Rewrites Ichthyosaur Evolution)

The images of ancient sea dinosaurs are interesting. The 190-million-year-old Ichthyosaur fossil rewrites the history of those sea dinosaurs. The long nose of that creature. Tells that this dinosaur could be quite fast. But. It also tells. About. The possibility. This dinosaur could need to avoid some acoustic organs. Sonar is what modern whales use to hunt their prey. The long nose causes an effect. That. The soundwave travels through those prehistoric predators. Could there be? Some sea creatures that use sonar for hunting? 

Maybe that ability was for the Livyatan. That creature was the ancestor of the sperm whale. 

Another. A very. Interesting detail. Are the smaller fish-saurs. Those dinosaurs are making the wheel-shaped form, with a hole in the middle of it. That means that the pack could hunt as a unit. So, could those smaller sea dinosaurs have similar behaviors to modern piranha? There is a possibility that when a bigger dinosaur tries to travel through that ring, those smaller fish cover that predator, and close its tonsils. 

They might also bite that larger prey. This means that the smaller fish-saurs. That attack against the much larger predators could also kill. A very large. Sea predators like Megalodon. Those smaller predators act like piranha. They trust their group force to hunt the far bigger sea predators. Those small fish-like dinosaurs can also blow water or send water impulses against those larger predators. 

So, could those kinds of predators still be found? Could some observations about the extremely large medusa be caused by? A fish pack that acts as a unit. We know that some fish act united. The entire swarm acts. Like. One individual. And the question is: would there be some sea predators? That acts like herring?

https://scitechdaily.com/new-190-million-year-old-sword-dragon-rewrites-ichthyosaur-evolution/

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