An oceanographer and someone who studies sharks is an ithcyologist.
Oceanographer.
A scientist who studies water is called a hydrologist. They study the distribution, movement, and properties of water on Earth, including its occurrence in rivers, lakes, and oceans, as well as underground.
marine biologist
An oceanographer is a scientist who studies the oceans and seas. They investigate various aspects of the marine environment, such as ocean currents, marine life, and the impact of human activities on the oceans.
An oceanographer is a scientist who studies oceanology, the branch of science dealing with physical and biological aspects of the oceans.
A scientist that studies bats is called a chiropterologist.
hydrologist
Marine biologist. Actually, a Marine Biologist is someone who studies marine organisms (plants, oceans, and animals), but someone who studies MAINLY marine mammals is a marine mammalogist.
A scientist who studies mollusks is called a teuthologist.
The name of a scientist that studies sports is called a sports scientist.
A scientist is someone who studies science.
A scientist who studies butterflies and moths is called a lepidopterist.