noun
emperor tetra
A species of freshwater fish (Nematobrycon palmeri) popular in aquariums. The name is a direct loan from English.
エンペラーテトラは南米原産の熱帯魚です。
The emperor tetra is a tropical fish native to South America.
水槽にエンペラーテトラを数匹入れました。
I put a few emperor tetras in the aquarium.