There are many different types. But one of the types is a marine zoologists. What they do is they help marine life like dolphins, rays, and sharks. You will use a lot of swimming to just help the animals. They also study how the animals live. They work in all types of water bodies from oceans to lakes. There are to types of marine zoologists ichthyologists and mammalogists. Ichthyologists deal with sharks and skates. Mammalogists deal with dolphins and whales. They also use water and animals to study there behavior. They go and study their natural habitat. There are many positions in marine zoologists. They also help take care of the other animals habitats from being destroyed. They also test and experiment things on fish and other animals. They also use them to see the fish population and other marine life.