Caption: An octopus cyanea hunting with a blacktip grouper on one side and a gold-saddle goatfish (‘blue goatfish’) on the other. An octopus patrols a shallow reef, searching for food–and it’s not ...

Freshwater trout migrations typically span just a few hundred yards and tens of miles. They’re not covering the distance that their anadromous relatives do, but they, too, will seek out new water for ...

Life revolves around water in this quiet fishing village in Brazil’s southern Pantanal, the world’s largest wetland. Here, a ...

Climate change is reshaping fish habitats. Some fish are winners, others are losing out. Subscribe to our newsletter for the latest sci-tech news updates. Fish already face plenty of pressure from ...

Learn how fish in the Democratic Republic of the Congo scale a near-vertical waterfall using microscopic hooks. A waterfall isn’t supposed to be climbable. But thousands of small fish are doing it ...

When you think about climate change in our oceans, you may picture coral bleaching, melting sea ice, or extreme weather events. But beneath the ocean's surface, another quiet shift is underway.