While some fish are large, like the whale shark, they are filter feeders and don't have the mouth or jaw strength to swallow a human.
The largest fish, the whale shark, has a mouth that can reach up to 4.5 feet wide, but their diet consists primarily of plankton and small fish.
Other large fish like the great white shark, while known for their size and powerful jaws, are not large enough to swallow a human whole.
It's important to remember that these animals are wild and should be treated with respect.