Climate change is the greatest threat to the world’s coral reefs. Reducing emissions will limit its impacts, but this action alone is no longer enough to guarantee the future of reefs.
Suites of interventions are being developed and trialled to increase coral reef resilience by helping reefs resist, adapt to or recover from the impacts of climate change
Components
Below are some examples of recent intervention risk work conducted by AIMS in collaboration with intervention development programs.
Ecological Risk Database (global) developed through the CORDAP Landscape Study on Managing Ecological Risks (Pears et al 2024, Hammerman, Allen et al., 2026)
The gender pay gap is the difference in average earnings between women and men in the workforce, expressed as a proportion of men’s earnings. It is the consequence of a range of societal, industrial, and organisational factors that combine to reduce a person’s earning capacity.
It is not to be confused with equal pay that is being paid the same of the same or comparable job.
In Australia, the cost of decommissioning offshore oil and gas infrastructure at the end of its operational life is estimated to be US$40.5 billion involving approximately 1000 wells and more than 8000 km of pipeline.
To help inform decommissioning decision making, scientists, including those at AIMS, are working to understand in more detail the impacts of what happens when we remove infrastructure fully, leave it partly in place, or repurpose it after it has reached the end of its operational life.
One of the greatest challenges of reef restoration on the Great Barrier Reef is its vast size. AIMS and its partners are meeting this challenge by bringing together the latest science, innovative technologies, and people power.
Components
Wild coral spawn is collected from the ocean surface at selected reefs during mass coral spawning events using hand-held spawn collectors and catchers. Collected coral spawn is transferred by small boats to larval rearing pools.
Larval pool in the northern GBR. Image: Gus Burrows
Once the larvae are fully developed and ready to settle, they are transferred and delivered directly onto a selected area of reef. Operators can release the larvae all at once, known as a larval cloud delivery, or deploy them using seeding devices.
By harnessing wild coral spawn, the slick collection and release method improves the odds for coral larvae to develop into young corals in areas of reef that need help. The method also takes advantage of local species and genetic diversity and is relatively low cost.
Over five years, scientists developed and trialled aquaculture systems with the capacity to produce millions of coral larvae and young corals every year. This can be done using existing land-based aquaculture facilities or as a ‘containerised’ unit, known as ReefSeed, which can be used more remotely.
The ReefSeed coral aquaculture system is designed to maximise fertilisation success and larval production. Image: Marie Roman
The process begins with the collection of wild coral colonies (the parent corals), which are then temporarily transferred to land-based facilities. These corals are spawned and larvae reared in semi-automatic conservation aquaculture facilities designed to improve health and resilience.
Young corals are settled onto modular tiles which are inserted into ceramic coral seeding devices. These devices are transported to vessels and deployed from the surface to their parent reef cluster (where the parent corals are also returned).
Conservation aquaculture is still in its infancy, but can produce many more corals that it did just a few years ago, at a fraction of the cost. The advantage of this method is that it supports the breeding and deployment of corals with higher heat tolerance, either through selective breeding or inoculation of heat-evolved symbionts. Corals bred for higher heat tolerance using these methods are not currently part of the pilot deployments.
Monitoring pilot deployments
Monitoring of the young corals after deployments is essential to understand the efficacy of the methods, and inform future iterations. Monitoring of sites will be conducted at multiple scales, and be carried out by science teams, industry and participating Traditional Owner groups.
Manual and tech-based monitoring approaches such as ReefScan and photogrammetry will be used across the sites, with some surveys continuing after the three-year program concludes.
Coral seeding devices on a reef. Image: Saskia Jurriaans
Device locations are geotagged and monitored in 6-month and 1-year intervals to measure retention, coral growth and survival. This data will help assess conservation aquaculture and inform coral resilience research.
People power behind the Pilot Deployments Program
A key practical part of scaling up reef restoration is to empower local people and industries, by building skills, capacity and partnerships.
One way to do this is by providing training in the advanced skills of reef restoration, with the intention that these skills will become increasingly valuable as reef restoration activities expand in the future.
In 2025, the Pilot Deployments Program established a Panel of Providers to deliver specific services and solutions over a three-year period. This includes coral seeding, monitoring and data collection. The Panel of Providers has Traditional Owner representatives, as well as tourism and commercial reef operators, and members of the coral collection and aquarist industry.
Traditional Owners
Traditional Owners hold important cultural and spiritual connections to Country, including sea Country on the Great Barrier Reef. These connections power deep knowledge and care for the Reef, and inherent rights and responsibility for its future.
The Pilot Deployments Program works closely with Indigenous communities. Free, prior and informed consent is obtained through Traditional Owner engagement before any Pilot Deployments Program activities.
For example, the AIMS-led Indigenous Futures Project works in partnership with Indigenous Ranger groups and the Pilot Deployments Program. Its goal is to empower Traditional Owners to lead in caring for sea Country through reef restoration techniques. A pilot group of Indigenous Rangers are being trained in advanced skills for reef interventions, enabling them to lead these activities within their ranger groups for the future of sea Country when and where required.
Indigenous Futures participants near Heron Island in 2024. Image: Phil Schouteten
Technological advances for Pilot Deployments Program
Several technologies have been pioneered and refined for use in Pilot Deployments Program operations. Technological advances will continue based on feedback from early Pilot Deployments Program data. Some examples of technologies which have already emerged include:
One way to ‘seed’ corals back onto reefs is to place newly settled corals onto specially designed and manufactured devices (which we call seeding devices) and then deploy the devices onto a reef.
Seeding devices are used in reef restoration worldwide. Our seeding device designs are evolving to suit the specific needs of large-scale reef restoration on the Great Barrier Reef.
The latest designs incorporate modularity, multidimensionality, and features for improved retention and coral protection, as well as ensuring compatibility with automated production processes and robotics. They are designed so that they can be coated with antifoulants or probiotics that can boost young coral growth.
The coral larval pool technique, sometimes called Coral IVF, involves collecting coral eggs and sperm during mass spawning events in the wild, which was first pioneered by AIMS scientist Dr Andrew Heyward at Ningaloo Reef in Western Australia and was first developed on the Great Barrier Reef by Professor Peter Harrison of Southern Cross University. After fertilisation, they develop into larvae in protective mesh nets inside large inflatable pools floating on the ocean surface, where they are cultured for 4-6 days.
Once larvae are fully developed, there are two different approaches for settling them.
The first, releases the larvae from the large Southern Cross University culture pools while they are still free-floating. This larval cloud release allows coral larvae to settle on the reef, but they may drift some distance before finding their preferred spot.
Alternatively, larvae can be settled onto settlement devices in the large culture pools or some larvae can be transferred into smaller settlement pools. This method has been developed by SECORE International, whose pools are referred to as a CRIB (Coral Rearing In-situ Basin).
The Deployment Guidance System (DGS) integrates AI and marine robotics with expert ecological knowledge to select suitable sites for coral deployments. It first charts a coverage map across the chosen site. With the aid of an autopilot, it surveys the site in real-time using cameras with AI. Coral devices are surface deployed, with GPS marking their locations to help ongoing monitoring.
Uncrewed and crewed device dispensing machines are also being developed, that can feed in stacks of devices and then dispense them as guided by the DGS.
The Deployment Guidance System during tests off Magnetic Island. Image: Jakub Jez
Management
The innovative approaches being developed within the RRAP and the Pilot Deployments Program contribute to a toolbox of options for future management needs. It is critical they are developed with this end-use in mind.
Pilot Deployments Program activities align with Reef protection objectives, regulations and permitting processes from the Reef Authority and the Queensland Department of Environment, Tourism, Science and Innovation (DETSI).
AIMS collaborates with both regulatory bodies to codesign and implement the trials, and continue R&D.
The Pilot Deployments Program is funded by the Australian Government’s Reef Trust, and led by the Australian Institute of Marine Science. It is part of the Reef Restoration and Adaptation Program, funded by the partnership between the Reef Trust and the Great Barrier Reef Foundation.
To fight the compounding negative impacts of climate change and plastic pollution on marine environments, AIMS scientists have teamed up with India’s National Centre for Coastal Research (NCCR).
There are many ways to measure the status of coral reefs. One of the most common is to use percent hard coral cover as an ‘indicator’ of reef condition because it describes the abundance of a critical ecosystem engineer on coral reefs. This measure describes the proportion of the seafloor that is covered in live hard coral. Percent hard coral cover is widely used by scientists worldwide and is a standard measure that applies to all locations. While it does not tell us anything about the diversity or composition of coral assemblages, it provides a simple and robust measure of reef health.
Percent hard coral cover can be estimated using various techniques. The technique used for this report is manta tow surveys, which are visual estimates of percent hard coral cover over the area covered by an observer during one 2-minute tow (~2000m2). The percent hard coral cover for a reef is then estimated as the average of the estimates from all tows around a reef and reported as broad categories (e.g., 0 = 0%, >0% – 10%, >10% – 30%, >30% – 50%, >50% – 75% and >75% – 100%; See video below).
A coral reef consists of more than just hard coral and contains a diverse array of other corals, sponges, algae, sand, rock and invertebrates. It is relatively rare for Great Barrier Reef reefs to have 75% to 100% hard coral cover and AIMS defines >30% – 50% hard coral cover as a high value, based on historical surveys across the Great Barrier Reef.
Other techniques for determining percent hard coral cover involve counting the number of points within sampling units (quadrats, photos), as used by LTMP in fixed site surveys, or the linear distance along a tape measure (line-intercept) that intersect live hard coral colonies. Adding up the total number of points of live hard coral cover and then expressing this as a percentage of the total number of points within a sample yields the estimates of hard coral cover. Data from both the fixed site and manta tow surveys conducted by the LTMP are highly correlated and show the same trends in hard coral cover estimates. However, manta tow estimates are generally lower than those obtained from fixed site surveys as they encompass the entire reef, including sandy back reef habitats that have low coral cover.
A visual guide to the different categories of coral cover used for reef surveys.