Neon tetra fish are members of the scientific family ... They have silver-white bellies and light blue backs. There are very few differences between male and female neon tetra.

The cardinal tetra is one of the most well ... among some of the most beautiful aquarium fish. Their most striking feature is the fluorescent blue stripe running laterally throughout their body.

The Mexican tetra fish that lives in the rivers of Northern Mexico can heal its heart, while its cave-dwelling relative cannot A fish that can repair its heart may hold clues for future treatments ...