Ichthyohagy n. : The practice of eating, or living upon, fish.

Example:


Taxonomy
fish, ichthyology, ichthyologists, species of fish, species, study of fish, American Society of Ichthyologists and Herpetologists, free encyclopedia, manuscript, taxonomy, Society, fish species, European Renaissance, Exploration, Colonization, 1500 BC, 335 BC, Peter Artedi.

Defination from the web:
ichthyology into formal scientific study. ... Diversity of fish · Fish development · Spawning · Spawning triggers · Roe · Capacity for pain · Diseases and parasites · Fear of fish · Ichthyology · Prehistoric fish ...