This answer is a entomologist
A scientist who only studies fish is called an ichthyologist.
An ichthyologist is a scientist that studies fish
Ichthyology is the branch of zoology devoted to the study of fish.
An Ichthyologist
A scientist who studies fish.
The name of a scientist that studies sports is called a sports scientist.
An Ichthyologist.
Ichthyologists are scientists that study fish
A palaeoichthyologist is a scientist who studies prehistoric fish.
An arachnologist
A virologist is a scientist who studies viruses.
A scientist who studies animals is called a zoologist.
Ichthyology is the study of FISH. SO … an Ichthyologist is a scientist who studies FISH.