Fish schooling is a behavior where a group of fish swim together in a coordinated manner. Some synonyms for fish school include fish shoal, fish herd, fish swarm, and fish congregation. These terms are often used interchangeably, but there are slight differences in their meanings. A fish shoal typically refers to a loosely organized group of fish, while a fish herd implies a more tightly knit group. A fish swarm typically refers to a large group of fish that move quickly and erratically, while a fish congregation implies a gathering of fish in a certain area. Whatever the term used, observing a fish school is an impressive display of nature's coordination and synchronization.