A fish genus refers to a group of related fish species that share similar physical traits. There are several synonyms that can be used to describe a fish genus, including fish species group, piscine classification, and fish family. Additionally, ichthyologists, or scientists who study fish, may use the terms piscine taxa or fish genus classification to refer to groups of fish that are closely related. Different types of fish genera may have distinct physical characteristics, such as differences in fin shape or color, and may inhabit different parts of the world's oceans, lakes, and rivers.