Fish swimming in underwater kelp forest

Turf Algae and Kelp Forests

Structurally complex kelp forests, pushed beyond their tipping points, are being replaced by mat-like, low-structure turf algae around the world.
Limnoria quadripunctata, male and female, ventral view.

How “Termites of the Sea” Have Shaped Maritime Technology

These small marine pests have been eating our ships for millennia, forcing us to keep building better boats throughout history.
Elysia clarki

Solar-Powered Sea Slugs and Survival in Future Seas

These Florida mollusks make off with chloroplasts from algae and cleverly photosynthesize them for their own nutrition.
Black-Tip Reef Sharks in shallow water lagoon, Fakarava, Tahiti

Sharks Are Hiding from Scientists in Plain Sight—Almost

Marine biologists need to count sharks to save them, but the common practice of using video cameras to record populations could be improved.
Copepod

The Little Plankton That Could

Arguably the world's most abundant animal, calanoid copepods can leap like whoa Nelly. And check out their enigmatic embryos!
Atlantic horseshoe crab (Polyphemus occidentalis) illustration from Zoology of New york (1842 - 1844) by James Ellsworth De Kay (1792-1851).

The Horseshoe Crab: Same as It Ever Was?

The seemingly static appearance of these ancient-looking arthropods presents a challenge for scientists who want to study their evolutionary history.
Many cassiopea xamachana, upside down jellyfish

Upside-Down Jellyfish and the Mucus of Death

You could get stung by a jellyfish even when there don't seem to be any around. Meet Cassiopea xamachana and its "stinging water" weirdness.
An octopus

Stuck in the Midden with You

A midden is, among other things, a refuse site outside an octopus' home. (Release the Køkkenmødding!)
Pendant in the Form of Neptune and a Sea Monster

The Lumpy Pearls That Enchanted the Medicis

There’s a specific term for these irregular pearls: “baroque,” from the Portuguese barroco.
A shark being cleaned by smaller fish

Where the Small Fish Clean the Bigger Ones

A "cleaner station" is a sort of undersea business, a place where large, often predatory, fish go to have parasites removed.