Divemaster Rugene "Spider" Marinus of Toucan Diving and Phyllis Mihalas cut cluster of line, hooks and rope off the trapped creature.

The joy and drama of life are on simultaneous display as sea turtle hatchlings dash across the beach of Heron Island to the ocean under the preying eyes of silver gulls.

Every fall, Lake Superior’s Silver Harbour Conservation Area becomes the spawning ground for mass aggregations of whitefish under the cover of night.

Highly venomous olive sea snakes most often "attack" divers during mating season, chasing them and sometimes even biting them, in what might be a case of mistaken identity.

Tuna, historically overfished, are on the road to recovery, but more sharks and rays are now listed as threatened with extinction, according to this month's IUCN Red List Update.

Ninety-six percent of the films included in the study represented sharks as potentially threatening to humans.

One determined diver achieves her dream of going nose-to-nose with an apex predator in its natural habitat. Here’s how you can dive with leopard seals in Antarctica too.

The new jelly was spotted off Rhode Island while the shark was discovered between Antarctica and Africa.

In this edition of Ask a Marine Biologist, Dr. David Shiffman answers a question about what’s still lurking in the deep.