Anchovies are a large group of fish that have varieties of looks but normally are thin, expose at least half of their bodies, and have eyes on top of their heads. Some of them appear to go to Bikini Bottom High School, where they are loved and adored by teenage girls. Known anchovies include a handsome anchovy named Billy Fishkins, a nerdy anchovy named Brian Flounder, and an over-rated anchovy named Octavius Rex, whom Pearl once dated and is nicknamed "Long, Tan, and Handsome" even though the latter doesn't apply very well.
The language of anchovies is very unique. They usually only say "meep", but in the episode I'm Your Biggest Fanatic they are able to say other things. They are loved around Bikini Bottom High School, but they cannot respond. It is shown that some anchovies are able talk normally. For example, Mable is an anchovy who is able to talk in English instead of saying "meep".