Ichthyology is the branch of zoology which deals with the study of:-

The correct answer is the Study of fish.

Key Points 

• Ichthyology 
  • Ichthyology is the branch of zoology which deals with the study of fish, including bony fish, cartilaginous fish, and jawless fish.
  • The study of fish dates from the Upper Paleolithic Revolution. 
  • The science of ichthyology was developed in several interconnecting epochs, each with various significant advancements.
  • The study of fish receives its origins from humans' desire to feed, clothe, and equip themselves with useful implements

Additional Information 

• The study of reptiles and amphibians is a branch of zoology called Herpetology.
• The branch of zoology which deals with the study of birds is called ornithology.
• Entomology is known as the study of insects.