Ocean “Dead Zones” Create Breathless Waters

The ocean feels like endless life, yet some waters become nearly breathless. These ‘dead zones’ often result from a quiet chain reaction.\n\nExcess nutrients (especially nitrogen and phosphorus) fuel rapid algal growth. When algae die, bacteria decompose them and consume dissolved oxygen, shrinking habitable space for fish and shellfish.\n\nSurprising detail: it’s not only death—it’s behavior shift. As species flee, food webs distort, and recovery may take years until water chemistry stabilizes.\n\nIt’s a reminder land and sea are connected. Loads from farms, cities, and rivers can translate into oxygen-starved coastal ecosystems, and reversing that can be slow and hard.