There are around 354 species of shiny ray-finned fish found in 11 families in this order. They are found in freshwater, brackish, and saltwater habitats all over the world.

These fish usually live near the surface of the water and swim in schools, which makes them easier to spot.

Most Atheriniformes have slender, elongated bodies and two dorsal fins, which help them move quickly. Most species are silver and small. They usually eat tiny plants, plankton, and small insects, making them an important part of the food chain, feeding bigger fish, birds, and other animals.

Silversides usually spawn in large groups, and their eggs and young provide food for many other animals.