Fish With Ugly Teeth

- Cichlids congregating at lekking sites form an aggregation.
- Many minnows and characins form shoals.
- Anchovies, herrings and silversides are classic examples of schooling fish.
While school and shoal have different meanings within biology, they are often treated as synonyms by non-specialists, with speakers of British English using "shoal" to describe any grouping of fish, while speakers of American English often using "school" just as loosely.