|Scientific name :||Hyphessobrycon eques|
|Higher classification :||Hyphessobrycon|
The serpae tetra (Hyphessobrycon eques), also known as jewel tetra or callistus tetra, is a species of tropical freshwater fish of the characin family (family Characidae) of order Characiformes. It is native to the Amazon River drainage in Brazil, Peru, Paraguay, Bolivia and northern Argentina. The fish can be found in slow moving or still backwater including, ponds, small lakes, and streams. In the wild, it forms aggregations around vegetation and tree roots, and thrives when the water temperature is 22-27 °C (72-82 °F).
Serpae tetra can grow to be 5 cm (2 in). They have very distinctive coloring with a red body and a black spot near their eye. It is an omnivore and will feed on flake and blood worms.
Breeding, as with most other tetras, can be difficult due to the few obvious differences between the genders. However, males are usually slimmer and smaller than females. Also, a visible difference in the shape of the swim bladder can be seen above and behind the silverish abdominal cavity. To breed these fish, they should be given a small, dedicated breeding tank planted with thick bunches of fine-leaved plants such as Myriophyllum on which they can lay eggs. Filtering through peat moss can also be helpful. The eggs hatch in about a day. The average lifespan for a serpae tetra is about seven years.