rivulus
/ˈrɪvjələs/
noun
- A small fish of the genus Rivulus, found in fresh and brackish waters of the Americas, often kept in aquariums.
- During the dry season, rivulus can survive in small puddles of water.
- Scientists discovered a new species of rivulus in a remote stream in Brazil.
- The rivulus is a popular choice for home aquariums because of its bright colors.