Juvenile fish are young fish that have recently hatched or developed from eggs. They are typically in the early stages of their life cycle and are often smaller and less developed than adult fish. During this stage, they rely on their environment for food and protection as they grow and mature. As juvenile fish grow, they undergo various changes, including shifts in diet and habitat. They may start as plankton feeders and gradually transition to eating larger prey. This growth phase is crucial for their survival, as it helps them adapt to their surroundings and prepare for adulthood in their respective ecosystems, such as coral reefs or freshwater rivers.