Niers are small, freshwater fish belonging to the family Cyprinidae. They are commonly found in rivers, lakes, and ponds across various regions. Known for their slender bodies and vibrant colors, Niers play a crucial role in their ecosystems by serving as both prey and predator. These fish are often popular among aquarium enthusiasts due to their lively behavior and adaptability. Niers typically feed on insects, algae, and small crustaceans, contributing to the balance of their aquatic environments. Their presence can indicate the health of freshwater habitats, making them important for ecological studies.