Siamese fighting fish, in a fish tank. 泰國鬥魚, 魚缸

A Siamese fighting fish with colors resembling the Thai national flag swims in a fish tank in Nakhon Pathom, Thailand on In Nov. 17, 2016. (Photo: Chuchat Lekdeangyu/Shutter Prince via AP)
Photos of the day - November 17, 2016
https://www.yahoo.com/news/photos-day-november-17-2016-182508425/photo-p-siamese-fighting-fish-colors-photo-182508815.html

Siamese fighting fish - Wikipedia

泰國鬥魚