Coral Reefs

With spikes as long as knitting needles, long-spined sea urchins may look like underwater villains, but their appetite for algae makes them the unsung heroes of Caribbean reefs.

The Valiant Effort to Restore the Caribbean's Sea Urchins

The very hungry, spiky custodians gobble up the algae that smother coral reefs

Rice coral grows over another species of coral.

These Supercorals Are Causing Problems

As rice coral spreads it reduces biodiversity

One of the new benthic landers is lowered into the Gulf of Mexico via a system of winches and safety lines. Once released, the autonomous platform sinks at a carefully calculated rate until it lands on the seafloor.

These Innovative Landers Will Examine Coral Reefs in the Gulf of Mexico

Scientists plan to use what they learn to help restore communities harmed by the Deepwater Horizon oil spill

Bleached corals in the Great Barrier Reef during a previous mass bleaching event.

The World's Fourth Mass Coral Bleaching Event Is Underway—and It Could Become the Worst One Yet

The impacted reefs represent 54 percent of the planet's total, and that figure is currently increasing by 1 percent each week, NOAA scientists say

Imagine dragons—or go for a dive in the Pacific Ocean and keep an eye out for this astonishing two-inch sea slug known as Goniobranchus sp. 1.

Dive Into the Exotic World of Nudibranchs, the Spectacular Slugs of the Sea

Psychedelic hedgehogs, purple pineapples, living strawberries—these tiny creatures show off their big personalities off the Australian coast

Common clownfish have three white stripes, which they "count" to identify other members of their species as potential threats, a new study suggests.

Clownfish Can 'Count' Stripes on Other Fish to Identify Intruders, Study Suggests

Notoriously aggressive, common clownfish may be using basic mathematics to determine if another fish is a friend or foe

A team including research scientists at Smithsonian's National Zoo and Conservation Biology Institute became the first in the world to successfully cryopreserve coral using a technique called isochronic vitrification.

Scientists Cryopreserve and Revive Coral Fragments in a World First for Conservation

The new freezing technique could reinvigorate corals suffering from warming oceans—or even preserve human organs in the future

Geochemist Blake Dyer observes the north shore of Molokai.

Scientists Look to Ancient Hawaiian Reefs for Clues About Future Sea-Level Rise

Researchers search the shores of Molokai for fossils to help predict the impact of melting ice sheets on our oceans

A trumpetfish shadows a parrotfish. A new study suggests that this tactic makes it harder for prey to notice the predatory trumpetfish behind the non-threatening, plant-eating parrotfish.

These Long, Skinny Fish Hide Behind Bigger Fish to Sneak Up on Their Prey

Scientists made 3D-printed models of fish and tested them in the ocean to study this clever hunting strategy

A diver swims around a coral reef in Key West, Florida, on July 14, 2023. Coral reefs in the Florida Keys are at risk of bleaching and death because of very hot water temperatures this summer.

Water Temperatures Hit 'Hot Tub' Levels in the Florida Keys

A buoy in Manatee Bay recorded 101.1 degrees Fahrenheit on Monday evening, as coral reefs suffer

Antler coral can host different types of algae, sometimes resulting in differences in color. 

This Pacific Coral Can Withstand Warming Waters With the Help of Algae

The heat-resistant organism in antler coral may help it adapt as ocean temperatures increase

A coral reef in Honolulu, Hawaii. Half of global coral coverage has disappeared since the 1950s.

Coral Reefs Host a Vast Diversity of Microbes

A two-year expedition at sea uncovered more than half a million varieties of microbial life in Pacific reef-dwelling organisms

Diadema antillarum sea urchins in the Caribbean Sea

Scientists Solve a Sea Urchin Murder Mystery

A microscopic parasite that has been killing the Caribbean creatures since last year might also be at fault for a population collapse four decades ago

The submersible Alvin collects samples from rocky outcrop in the newly discovered coral reef.

See the Pristine Coral Reefs Found off the Galápagos Islands

These ancient deep-sea reefs have barely been affected by humans and can provide a way to measure the impact of climate change on corals

Technician Yesmarie De La Flor prepares cultures of probiotics in the Smithsonian Marine Station’s microbiology laboratory in Fort Pierce, Florida. These probiotics were used for testing on diseased corals.

Probiotics May Help Corals Fight a Dangerous Disease Off Florida’s Coast

The new treatment shows promise in lab experiments

Many animals like corals release eggs and sperm into the water on just the right nights of the month.

How Lunar Cycles Guide the Spawning of Sea Creatures

Researchers are starting to understand the biological rhythms that sync worms and corals to phases of the moon

A scuba diver encounters fish swimming around a reef in the Maldives.

The Top Eight Ocean Stories of 2022

The biggest saltwater moments of the year included major discoveries that inspired awe

The first juvenile collector urchin (Tripneustes gratilla) raised from a cryopreserved embryo.

A Graduate Student’s Research Could Help Stop the Spread of Invasive Seaweed in Hawai'i

For the first time, using cryopreservation to freeze sea urchin embryos may help restore coral reefs

The elkhorn coral is one of the most endangered corals in the Caribbean and the Florida Keys. In Florida alone, the population is reduced by over 95 percent. A coral breeding project using elkhorn coral gametes collected in Florida and Curaçao hopes to give this species a new lease on life. 

This Moonshot for Coral Breeding Was Successful

But the coral are still in tanks, waiting to be released on reefs

A model of an oarfish

Rare Oarfish Caught on Video on Great Barrier Reef

This is the first record of the species on the eastern seaboard of Australia

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