You will find three big types or classes of fish: jawless, cartilaginous, and bony fish. An illustration of a jawless fish will be the lamprey eel. Sharks are cartilaginous fish plus the blue marlin is actually a bony fish. Once the time arrives, they come back to freshwater to spawn. https://finncyvqk.blogtov.com/7623618/the-2-minute-rule-for-run-fish-run-twitter