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 ...

If you see it, kill it. An invasive fish species is harming the Mississippi ecosystem, and you can help stop it. Northern snakeheads (channa argus) are native to East Asia. They've been confirmed in ...

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 ...

Most people assume that fish are perfectly safe underwater and that drowning is impossible for them. After all, they are uniquely designed for life beneath the surface. But the idea that fish cannot ...