Marine Biologist: a person who studies organisms in the ocean (salt water) or other marine or brackish bodies of water.
Lots of biology; basic understanding of science in general (Physics/Chemistry), anmd math (At least calculus) also computer and technical skills.
With the average Ph.D marine biologists make anywhere from $45,000 to $65,000. Full professsors make from $65,000 to $100,000.
This looks as if this Whale Shark was going to eat this human, but no, whale sharks do not actually eat humans. Whale Sharks just eat krill and other small fish.