Off the coast of Miami, divers are gearing up for a lionfish derby, organized for the first time by Diver’s Paradise, to help protect Florida’s marine ecosystems.

Few divers would give up the chance to swim with the two largest fish in the sea—whale sharks and basking sharks. Here's where to make it happen.

One travel-weary diver finds respite on a weeklong liveaboard trip. On the agenda: snorkeling with humpback whales in Silver Bank, a protected breeding area.

After sea star wasting disease wiped out more than 90 percent of the ocean's wild sunflower sea star population, divers brave the cold Alaskan waters to find traces of the remaining population.

In this edition of “Ask a Marine Biologist,” Dr. David Shiffman discusses a challenging environment for marine life.

On a late-night dive in Sitka, Alaska, two divers encounter myriad fascinating creatures, including a giant Pacific octopus on the prowl.

Discover how to ethically (and legally) swim with wild dolphins. Learn about respecting their space and behavior and choosing responsible tour operators to ensure both your safety and the well-being of these marine mammals.

Masters of disguise, the leafy sea dragon is one of the trickier ocean critters to spot. Here's why these mythical-looking animals dazzle us—and how to take the perfect photo.

Great whites get all the glory, but bottom-dwelling sharks bring plenty to the table. Here, we're looking at some of our favorite seabed shark species.