Science programme

Crown-of-Thorns Starfish (COTS) Monitoring & Management

Monitoring and removing coral-eating crown-of-thorns starfish helps protect vulnerable reefs and supports coral recovery across our monitoring sites.

Introduction

Crown-of-thorns starfish (COTS; Acanthaster spp.) are naturally occurring coral predators that play an important role in healthy reef ecosystems. However, when populations increase beyond natural levels, COTS can consume large areas of living coral and become a significant threat to reef health and recovery. Raja Ampat's coral reefs are globally recognised for their biodiversity and ecological importance, making early detection and management of COTS populations an important component of reef conservation. Barefoot Conservation integrates COTS monitoring and removal into our regular dive operations to help reduce pressure on vulnerable coral communities.

What We Do

COTS monitoring is conducted during regular research and conservation dives across local reef sites. When COTS individuals are encountered, trained team members assess, record, and remove them using appropriate removal techniques.

By conducting removals consistently throughout the year, we aim to prevent localised increases in COTS abundance and reduce potential impacts on coral communities. Observations also provide valuable information on COTS distribution, abundance, and potential changes in population trends over time.

What you would actually do

Participants learn about COTS ecology, their role within reef ecosystems, and their potential impacts during science training sessions.

Depending on training and experience, participants may assist with:

  • Identifying crown-of-thorns starfish during surveys
  • Recording COTS observations and locations
  • Assisting with removal activities under supervision
  • Documenting impacts on coral colonies
  • Contributing to reef health monitoring efforts

Through participation, divers gain practical experience in reef management techniques and learn how targeted conservation actions can support coral reef resilience.

Project outcomes

Regular COTS monitoring and removal efforts help protect coral communities across Barefoot's monitoring sites while contributing valuable information on local COTS populations. Data collected through the project are shared with Raja Ampat Sea People and findings are communicated with BLUD UPTD Pengelolaan Kawasan Konservasi di Perairan Kepulauan Raja Ampat to support broader reef management efforts. By combining consistent field observations, community participation, and collaboration with local conservation organisations, the project contributes to protecting Raja Ampat's coral reefs from one of their most significant biological threats.

Other programmes

Coral Ecology

Our flagship research program monitors reef health, coral bleaching, spawning events, and environmental conditions to better understand how Raja Ampat's reefs respond to a changing world.

Coral Restoration

Help grow the next generation of corals. Through nursery maintenance and scientific monitoring, we combine reef restoration with long-term research.

Reef Check

Using one of the world's most widely recognised reef monitoring programs, we collect data that contribute to national and global assessments of reef health.

Manta Ray Photo-Identification

Every manta ray has a unique pattern. By photographing and identifying individuals, we contribute to long-term monitoring of Raja Ampat's manta populations.

Cyanobacteria & Water Quality

Investigating the links between water quality, cyanobacteria, and reef health helps us better understand the environmental pressures facing coral reefs.

Marine Debris

From beach clean-ups to long-term monitoring, we track marine pollution and support community-led solutions to keep Raja Ampat's coastlines healthy.

Community Engagement & Education

Conservation extends beyond the reef. Through environmental education, beach clean-ups, and community activities, we work alongside the Arborek community to support marine stewardship and environmental awareness.

Train on this programme.

No previous scientific experience is required. All training is provided by our science team.

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From £1,895
4–5 weeks

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