Why we do not grow corals

Coral Farming, Reef Restoration, and the Hard Truth About What Actually Helps Coral Reefs

Why Marine Conservation Philippines takes a cautious stance on coral propagation projects — and why effective conservation is often less visible than people expect.

The Appeal of Coral Farming

Few conservation activities capture the imagination quite like coral planting. The idea feels intuitive. Corals are disappearing, so surely the solution is to grow more corals and place them back onto reefs. To many people, coral propagation appears equivalent to planting trees to restore a forest. It is visible, hands-on and very photogenic. The notion that is helps a reef recover makes it very attractive and satisfying for participants. too of course.

This is precisely why coral farming and coral planting programs have become so popular across the world, particularly within dive tourism. But coral reefs are not forests. The underwater environment is different. In general terms, if a place is suitable for coral growth, it will already have corals. If the corals die in that place, the stressors that cause them to die is what restoration efforts need to address, rather than planting more corals that also inevitably will die. Once the circumstances are beneficial corals will slowly regrow.

And while many coral propagation projects are driven by genuinely good intentions, the scientific reality is far more complicated than most people realize.

At Marine Conservation Philippines, we are often asked why we do not run large-scale coral planting programs. The answer is not because we do not care about reef restoration. It’s exactly the opposite. It is because we care deeply about directing limited conservation funding, volunteer energy, and community effort toward actions that actually improve reef resilience over the long term. That means being honest about what works, what does not, and what may unintentionally cause harm.

First: Coral Restoration in the Philippines Is Heavily Regulated

One of the least discussed aspects of coral propagation is that coral is legally protected in the Philippines.

Under the Philippine Fisheries Code of 1998 (RA 8550), as amended, it is unlawful to gather, possess, sell, or export corals. BFAR Administrative Order No. 202 further reinforces restrictions on coral exploitation.

This creates an important implication that surprises many well-meaning project proponents: Even collecting a naturally broken coral fragment and relocating it can legally constitute coral collection. In practical terms, coral propagation and restoration projects generally require multiple layers of approval and permitting, potentially including: BFAR permits, DENR approvals, Local Government Unit (LGU) permission and Protected Area Management Board (PAMB) approval in protected areas.

Additionally, in-sea nursery structures can legally be considered artificial reef construction, which is itself heavily regulated. (for good reasons, as artificial reefs often recruit fish from nearby natural reefs, selectively depopulating them, rather than seemingly create fish “out of nothing.”)

This matters because many dive centres, tourism operators, and volunteer organisations unknowingly expose themselves to legal risk by operating coral planting activities without the required permits.

Most are not acting maliciously; In many cases, people simply assume that because an activity appears environmentally positive, it must automatically be legal.  That of course is not always the case.

The Bigger Issue: Effectiveness

While legal issues are important, the larger issue is whether coral propagation meaningfully restores reef ecosystems.

To understand this, we first need to understand why reefs are declining.

Coral reefs today face a combination of chronic human stressors and climate-driven pressures: These include coastal development, sedimentation, pollution, overfishing, unsustainable tourism, rising ocean temperatures, and increased storm intensity and frequency to name some.

Reefs are not dying because they simply “lack corals.” They are dying because the environmental conditions required for corals to survive are deteriorating. This distinction is critical. If the stressors that killed the original reef remain unchanged, newly planted corals are usually exposed to exactly the same pressures. Which means they will die too.

Active vs Passive Restoration

In reef management, conservation interventions are often divided into two broad categories. Active and passive measures.

Active measures involve physically altering or engineering the reef environment. Examples include:

• Coral propagation and farming
• Artificial reef construction
• Coral transplantation
• Mineral accretion (“Biorock”) systems
• Structural reef enhancement
• Species introduction programs

Passive Measures instead reduce the stress acting upon the ecosystem and allow natural recovery processes to function. Examples include:

• Reducing sedimentation
• Improving wastewater management
• Regulating fishing pressure
• Establishing Marine Protected Areas
• Mangrove restoration
• Seagrass protection
• Improving tourism management

At first glance, active measures appear more exciting. They create visible action. People can photograph them. Volunteers can participate directly.
Funding bodies can easily communicate them to the public. Passive measures, by comparison, are slower and less glamorous. But they are often dramatically more effective.

Why Most Coral Fragment Propagation Fails

The most common form of coral propagation involves growing fragments of branching corals in nurseries before transplanting them onto reefs.

Branching corals are used because they grow quickly and fragment easily. Unfortunately, they are also among the least resilient coral growth forms.
They are highly vulnerable to bleaching, disease, predation, storm damage and algal overgrowth. The result is that many coral planting projects unintentionally create monocultures dominated by fast-growing branching species.

But healthy reefs depend on diversity. A resilient reef is not simply a large number of corals. It is a highly complex ecosystem containing many species, growth forms, genetic lineages, ecological functions, and stress tolerances.

Monoculture plantations cannot recreate that complexity, and as a result, survival rates are often extremely poor. Many projects lose the majority of transplanted corals within the first year, especially that rely predominantly on monocultures. Monitoring frequently stops after a short period, meaning long-term outcomes are rarely documented. This creates a difficult reality. Projects that appear highly successful in photographs may ultimately contribute little to nothing to long-term reef recovery.

Bleached branching coral 

Lab grown corals and future potentials

Lab-based coral propagation faces a different challenge. To make coral production financially viable, laboratory systems often optimize conditions very precisely, with stable temperatures, controlled lighting, reduces stress exposure and accelerated growth techniques. While this can increase production speed, it may also produce corals that have never experienced natural environmental stress.

In the wild, corals constantly face fluctuating temperatures, sediment loads, light changes, predation, and competition. Exposure to such stresses can trigger adaptive responses that improve resilience over time. Corals raised in highly controlled environments may lack these adaptive responses when transplanted back into natural reef systems, and the result can be catastrophic mortality once they encounter real-world conditions.

The future for coral farming is not “fragging” or easy coral planting projects, it is selective breeding, heat-tolerant genotypes, microbiome manipulation, stress hardening, cryobanking and larval propagation. These show much more promise, and it is the belief of MCP that coral restoration may play a limited, targeted role under specific ecological contexts, but current evidence suggests it cannot substitute for reducing environmental stressors, protecting biodiversity, and improving ecosystem management, despite advances in science.

Conservation Optics vs Conservation Outcomes

This is the uncomfortable part of the conversation. Coral propagation projects are often popular not because they are effective, but because they are visible. They create the perception of action. For tourism operators, they provide marketable experiences. For businesses, they create compelling branding opportunities. For volunteers, they offer emotional satisfaction. For politicians and institutions, they provide visible deliverables.

None of these motivations are inherently bad. Education and public engagement matter, and hands-on experiences can inspire future conservationists.

But problems arise when public perception begins to diverge from scientific evidence. In some cases, coral propagation becomes less about ecological restoration and more about conservation theatre. Meanwhile, the less visible interventions that genuinely improve reef resilience — wastewater management, fisheries regulation, mangrove protection, stakeholder engagement, and marine protected area enforcement — struggle to attract the same excitement or funding.

The Fundamental Ecological Reality

One of the most important lessons we have learned in the field is surprisingly simple: If environmental conditions are suitable for coral growth, corals will usually grow naturally. And if corals disappeared from an area, the most important question is not “How do we plant more corals?” it is “Why did the original corals die?”

Unless those underlying stressors are addressed, restoration efforts become a cycle of repeatedly placing vulnerable organisms back into unsuitable conditions.

This is why Marine Conservation Philippines prioritises reducing ecosystem stress over large-scale coral planting. Because functioning ecosystems are built on resilience, diversity, and environmental stability — not simply the physical presence of transplanted corals.

So What Actually Helps?

There are many conservation interventions that produce meaningful, measurable benefits for reef ecosystems and coastal communities, many of which we are engaged in at MCP. Examples include, beach and coastal cleanups, improved waste management, wastewater reduction initiatives, sustainable tourism education, protection and augmentation of mangrove forests, seagrass protection, fisheries management and alternative livelihoods creation, community action and engagement.

These projects are less photogenic than coral planting, but they address the actual drivers of reef decline. We are not opposed to learning opportunities. We understand why people are drawn to coral propagation. We understand the hope behind it, and and we understand the desire to take visible action in the face of environmental decline.

But our responsibility is not to promote what feels effective. Our responsibility is to support approaches grounded in ecological reality. Many of our volunteers are surprised to learn we do not grow corals, (the perception, that this is what tropical marine environmental protection is really all about is a persistent misunderstanding.). But their desire to help coral reefs is admirable.

The world needs more people who care, but also people who understand that effective conservation requires evidence, humility, patience, and the willingness to focus on solutions that may not always produce dramatic photographs or immediate gratification.

Coral reefs are among the most complex ecosystems on Earth.

Restoring them was never going to be simple.