Today, oceans host a large variety of fast, resilient marine predators, including tunas, mackerels and various other fish species. Many of these fish belong to a lineage known as Scombridae, whose members are characterized by fins supported by thin, bony structures known as rays.
Source: [Phys.org](https://phys.org/news/2026-07-tunas-ocean-predators-evolved-slowly.html)