An Ichthyologist.
An ichthyologist is a scientist that studies fish
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
An Ichthyologist
A scientist who studies fish.
A palaeoichthyologist is a scientist who studies prehistoric fish.
An ecologist studies pollution
A mineralogist studies minerals.
Smart,kind/friendly,careful. What they do: Reads,has fun with their job,studies fish and underwater animals.
The kind of scientist who studies Urology would be a Biologist, since Urology concerns a biological function (urination). If you mean the kind of doctor who studies Urology, that would be a Urologist.
meteoroligists
Audiologist
A zoologist.