Restoring freshwater habitats improves conditions for billions of wild fish, addressing both welfare and conservation concerns in degraded river systems.
Wild fish face habitat-related welfare challenges that include oxygen depletion from agricultural runoff, thermal stress from climate change and riparian tree removal, passage barriers that prevent migration to spawning and feeding areas, and physical injury from turbines and other infrastructure. Large-scale fish kills from episodic pollution events represent acute mass suffering. Restoration actions address these welfare concerns systematically: dam removal eliminates passage barriers and restores thermal refugia; riparian restoration reduces runoff and provides shade; floodplain reconnection creates habitat complexity. The scale of potential benefit is enormous — improvements to river systems benefit millions to billions of individual fish simultaneously.