When you and I take a deep breath, we pull air into our lungs. That’s because humans are mammals. But fish aren’t mammals. They usually don’t breathe air. They usually don’t have lungs. That’s what I ...

We can be guilty of thinking that oxygen is a uniquely human need. While all land-dwelling animals breathe oxygen from the air, fish need oxygen too. Not only this, but fish can run out of oxygen, ...

Fish live surrounded by water, so the idea that they might struggle to breathe sounds wrong at first. It feels like asking ...

Fish can suffocate and die from oxygen deprivation, even when surrounded by water. This occurs when dissolved oxygen levels are too low due to pollution, heat, or other environmental factors, or if ...

In this Aug. 2, 2007, photo, Godwin employees Robert Magdin, of Bridgeport, N.J., and Troy Ward of Charleston, S.C., weld the support structure for the return lines for the ReOxygenation Demonstration ...