The term "exotic fish" typically refers to any type of fish species that is not native to a particular location or region. Synonyms for the term "exotic fish" would include "non-native fish," "introduced fish," "alien fish," or simply "non-indigenous fish." The use of these synonyms is common in the field of conservation biology, where the introduction of exotic fish species can cause significant negative impacts on local ecosystems and biodiversity. In the aquarium trade, however, the term "exotic fish" is often used to describe uncommon or unusual fish species that are highly sought after by enthusiasts. In this context, synonyms might include "rare fish," "unique fish," or "uncommon fish".