Anadromous refers to fish species that migrate from saltwater to freshwater to spawn. This behavior is commonly seen in species like salmon and sturgeon. They typically spend most of their lives in the ocean but return to rivers or lakes to reproduce, ensuring their offspring have a safe environment to grow. The life cycle of anadromous fish involves several stages, including hatching in freshwater, migrating to the ocean, and then returning to freshwater to spawn. This unique migration pattern helps maintain healthy populations and ecosystems in both marine and freshwater environments, highlighting the interconnectedness of aquatic habitats.