Our mission is simple—but not really.

Every year, we train thousands of citizen scientist volunteers to survey the health of tropical coral reefs around the world and kelp forest ecosystems along the West Coast of North America.

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What we do and how.

Experts use the results from our dives to improve the way we manage our natural resources. Reef Check programs provide ecologically sound and economically sustainable solutions to save our reefs. We create partnerships among community volunteers, government agencies, businesses, universities, and other nonprofits.

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Coral Reef Program

With divers who survey the health and status of coral reefs, the Tropical Program uses a globally standardized scientific protocol to collect valuable data for reef management. Our EcoDiver teams span 102 countries and territories to help preserve and protect our coral reefs.

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leanne inverts north horn reef check
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Kelp Forest Program

The purpose of the Reef Check Kelp Forest Monitoring Program is to educate, train, and engage our community to monitor the health of our kelp forests. Local citizen scientist divers volunteer their time to support science-based ocean management and conservation.

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Reef Check Monterey California Program
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Dive into Science Program

Our Dive into Science Program aims to provide youth & young adults from under-resourced and tribal communities with a pathway to a career in conservation or college education in natural sciences or marine biology.

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Data is important to us.

Reef Check has coordinators, teams, and EcoDiver training facilities in countries around the world. Since the first Reef Check coral reef monitoring survey in 1997, our EcoDivers have completed over 17,000 surveys in 102 countries and territories. Our initiative is built on over 25 years of global reef health data.

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Lingcod are ferocious predators with big mouths and lots of very sharp teeth. Usually seen in Northern California, they can grow to be around five feet long!

Coral Reef Program

Together, we’ve completed 17,592

SURVEYSIN

102 Countries & Territories

Kelp Forest Program

Together, we’ve completed 2,066

SURVEYSAt

254 Sites

Education Program

Together, we’ve taught 1,300

StudentsFrom

32 Schools

The Octopus is a soft-bodied mollusk in the class Cephalopoda. Found in all the world’s oceans, there are almost 300 identified species. The word octopus comes from the Greek, októpus, which means "eight foot."

Anemones(Order Actinaria)

Species Data

Anemones are related to jellyfish, corals, and hydroids.
In California, Reef Check volunteers count all anemones larger than 10 cm wide and/or 10 cm tall.
Want to learn more? Visit the Global Reef Tracker

California Sheephead(Semicossyphus pulcher)

Species Data

The females that do turn into males usually change when they are about eight years old.
California Sheephead are typically found in Southern California and down to Baja California.
Want to learn more? Visit the Global Reef Tracker

California Sea Cucumber

Species Data

They are extremely important to the environment because they are detritivores which are animals that break down organic matter.
The California Sea Cucumber are typically seen from Central California to Alaska.
Want to learn more? Visit the Global Reef Tracker

Horn Shark(Heterodontus francisci)

Species Data

They are nocturnal and are usually found by Reef Check divers, hiding in holes and deep caves within the rocky reef.
They can reach up to three feet in length, but no one knows how old they live to be.
Want to learn more? Visit the Global Reef Tracker

Cabezon(Scorpaenichthys marmoratus)

Species Data

Cabezon are typically seen and counted on Central and Northern California surveys but can sometimes be found in Southern California as well.
Cabezon are a popular fish for recreational fishermen and the live fish fishery.
Want to learn more? Visit the Global Reef Tracker

Long-spined Black Sea Urchin(Echinothrix diadema)

Species Data

In the Caribbean, absence or low numbers may indicate urchin disease; high numbers are an indicator of overfishing of urchin predators
In the Indo-Pacific, high numbers are an indicator of overfishing of urchin predators
Want to learn more? Visit the Global Reef Tracker

Banded Coral Shrimp(Stenopus hispidus)

Species Data

These shrimp are among the cleaner shrimps that feed on parasites that live upon other reef organisms
They are fairly hard to see because they live under rocks and in crevices, but have very obvious red and white stripes and long, white antennae
Want to learn more? Visit the Global Reef Tracker

Grouper

Species Data

For Reef Check, only grouper greater than 30cm in length are counted since large numbers of small species can obscure overfishing of species that grow to larger sizes
Is a global tropical indicator organism of overfishing and the live fish trade
Want to learn more? Visit the Global Reef Tracker

Moray Eel

Species Data

Is a global tropical indicator organism of overfishing
Eels tend to hide in holes on the reef – you’ll rarely see them swimming around
Want to learn more? Visit the Global Reef Tracker

Parrotfish

Species Data

For Reef Check, only parrotfish greater than 20cm in length are counted since large numbers of small species can obscure overfishing of species that grow to larger sizes
All species in the Scaridae family are counted
Want to learn more? Visit the Global Reef Tracker

News and Events

Keep up with Reef Check! Get the latest news and information about how we’re contributing to the global effort to save and preserve coral reefs and kelp forests.

Expanding the Community of Kelp Forest Monitors: The Integration of Fishing Communities into Reef Check Baja California

April 29, 2026

In March, two more fishing cooperatives were trained to monitor kelp forests. Made possible by the collaboration with COBI (Comunidad y Biodiversidad, A.C.), Reef Check Baja was invited to teach…

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Latest Reef Check Coral Reef Data Available on Aqualink

April 29, 2026

The latest coral reef data from Reef Check has been uploaded to Aqualink! A year ago, Reef Check announced Aqualink as an official Global Reef Tracker partner for Reef Check’s…

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New EcoExpedition Available in Madagascar

April 29, 2026

Mora Mora Conservation with the University of Marche will organize two sessions of 14-day field courses on coral reefs in November 2026 and March/April 2027, taking you to the island…

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Reef Check Featured in New Documentary Holdfast Together

April 29, 2026

Reef Check is featured in a new documentary from Seatrees about the restoration of Northern California's kelp forests. Holdfast Together: Keepers of California's Kelp follows the divers, scientists, and conservationists…

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Photo of the Week: May 2, 2026

Reef Check's tropical program is divided into regions such as the Indo-Pacific, Caribbean and the Red Sea. Find out more about our protocol here.

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Members Worldwide

Become a Reef Check member or volunteer your time. You can even join our Adopt-a-Reef program and support our community-based monitoring and conservation of our coral reefs and kelp forests. Like the ocean, our opportunities to get involved are endless.

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