Fish larvae are the early life stage of fish, typically hatching from eggs. They are usually very small and have not yet developed the features of adult fish. During this stage, they rely on their yolk sac for nutrition until they can start feeding on tiny organisms like plankton. As fish larvae grow, they undergo significant changes, including the development of fins and scales. This transformation is crucial for their survival in aquatic environments. Different species of fish, such as salmon or tropical fish, have varying larval stages, which can affect their growth rates and habitats.