which shares the same river system in Southeast Asia. But this less celebrated species is a remarkable fish in its own right and, at 5 feet (1.5 meters) and 99 pounds (45 kilograms), it has no ...

Eventually, they'll go back to their own river, swimming and leaping back up to where they began life. Now, it's their turn to lay eggs that will hatch into young fish. Tuna fish live in salty water.