Small fish are typically defined as species that grow to a length of less than 10 inches. They can be found in various aquatic environments, including oceans, rivers, and lakes. Examples of small fish include guppies, neon tetras, and minnows. These fish often play important roles in their ecosystems, serving as prey for larger animals and helping to maintain the balance of aquatic life. Many small fish are popular in the aquarium trade due to their vibrant colors and active behavior. They are generally easier to care for than larger species, making them suitable for beginners. Additionally, small fish often exhibit interesting social behaviors, such as schooling, where they swim together in groups for protection and social interaction.