Portal:Fish/Selected picture/12
Appearance
![Siamese fighting fish. Selectively bred halfmoon male displaying his flared opercula.](http://upload.wikimedia.org/wikipedia/commons/thumb/1/10/HM_Orange_M_Sarawut.jpg/300px-HM_Orange_M_Sarawut.jpg)
The Siamese fighting fish (Betta splendens), or fighting betta is a freshwater fish related to the paradise fish. The fighting fish is a species in the Gourami family which is popular as an aquarium fish. They are called pla-kad (biting fish) in Thai or trey krem in Khmer. They are a very territorial fish and it is unwise to house two males together. Even the females may become territorial towards each other if not housed in a large enough tank.