Definition
'Anadromous' describes fish that migrate from saltwater to freshwater to spawn (reproduce). Salmon are the quintessential example; they live in the ocean but return to their natal rivers to lay their eggs. This journey can be incredibly arduous, requiring the fish to swim upstream against strong currents. The opposite of anadromous is catadromous. The anadromous lifecycle is sensitive to environmental changes. Protecting rivers is crucial for these fish.