ichthyology -
The branch of zoology devoted to the study of fish.
Wikipedia
Ichthyology is the branch of zoology devoted to the study of fishes. This includes skeletal fish, cartilaginous fish, and jawless fish. While a majority of species have probably been discovered and described, approximately 250 new species are officially described by science each year.
OmegaWiki Dictionary
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ichthyology The branch of zoology devoted to the study of fish.