Coral Reefs and Marine Conservation in the Philippines — What Is Happening at the "Center of the Center" of Biodiversity

As of 2026-08-31 · Updated 2026-08-31 · Section: Disasters, Environment & Climate · 日本語版

Editor's note: This article covers a field in which the site's operating company has business interests. It is compiled from publicly available and primary sources.

1. The big picture first — why the Philippine seas are special

Together with Indonesia, Malaysia, Papua New Guinea, the Solomon Islands, and Timor-Leste, the Philippines forms the Coral Triangle. Within it, the central Philippines is considered the "center" — and this claim has a clear origin and a clear metric.

The origin of the claim that this is "the center of the world's marine biodiversity"

注 A point that trips people up: In Japanese-language sources this tends to get flattened into "the Philippines has the world's greatest marine biodiversity," but what the original paper actually showed was the number of coastal fish species per unit area. On coral species count alone, eastern Indonesia and the Papua region are roughly comparable. Writing "world's best" without specifying the metric invites pushback.

Carpenter died on 12 July 2026 at age 73 (Mongabay, 2026-07-14). His account of "literally falling out of his chair" when he made this discovery has become a standard anecdote in the history of Philippine marine science.

Verde Island Passage — the "center of the center"

The strait between Luzon and Mindoro. Carpenter's analysis identified it as the sea area with the highest concentration of species, and it was designated a Mission Blue "Hope Spot" in July 2023 (California Academy of Sciences, announced 2023-07-21). At the same time, it faces the following pressures:

• On 28 February 2023, a major oil spill off Oriental Mindoro resulted from a tanker sinking. As of March 2026 — three years later — compensation to residents is still reported as unresolved (Inquirer, 2026-03-03).
• On 27 July 2026, fisherfolk groups called for passage of the "Verde Island Passage Protection Act" ahead of the State of the Nation Address (SONA) (Inquirer, 2026-07-27). As of August 2026, upgrading it to a legally protected area under NIPAS has not been enacted.

2. Coral reef area and health

Area: how the "world's third-largest" ranking should be handled

The metric is coral reef area (behind Australia and Indonesia, per these sources). 注 Multiple figures circulate in Japanese-language articles — "world's second," "25,000 km²," "27,000 km²" — but this document adopts the 22,000 km² / world's third-largest figure confirmed in the two sources above, and treats the others as unconfirmed.

注 Figures differ by source (made explicit in the 2026-08-25 verification): §0 of the field "Environment and Biodiversity" gives the reef area as approximately 25,000 km², and further notes that "world's third-largest" is an unconfirmed ranking claim whose metric, compiling body, and year cannot be identified. Neither this article's 22,000 km² (Mongabay 2021 / Pew 2026) nor the other field's 25,000 km² has been deleted. The gap between them likely stems from differences in the compiling body (NOAA/Allen Coral Atlas lineage vs. ReefBase/WRI lineage) and in how "reef" is defined (coral-covered area vs. the full reef landform), but re-verification on 2026-08-25 again could not reach the primary statistics (the original tables from NAMRIA or the Allen Coral Atlas), and the discrepancy could not be resolved. 注 When citing "world's third-largest," always attach the 〈basis (area)〉〈source institution〉〈year〉.

Health: the share rated "good" is extremely low

注 In Philippine coral reef research it is customary to use a four-tier grading scale by cover: "Poor (0–25%) / Fair (25–50%) / Good (50–75%) / Excellent (75% or above)."

(Upgraded from "unconfirmed" to confirmed in the 2026-08-25 verification) The UP Marine Science Institute's nationwide survey led by Licuanan et al., "Initial findings of the nationwide assessment of Philippine coral reefs" (Marine Pollution Bulletin, published 2019), covered 166 sites across 31 provinces (Luzon 108 / Visayas 31 / Mindanao 27), surveyed between 2015 and 2017, and reported that zero sites were classified as "Excellent" and more than 90% were "Poor" or "Fair." The weighted average of coral cover was 22.8% (consistent with §3-2 of the field "Environment and Biodiversity"). 注 The previously written "2017–2019" was in fact the publication date, not the survey period — this was an error and has been corrected. 注 Note: two different figures both happen to be 166 and should not be confused. These "166 sites" (coral-reef survey sites) and the "166 stocks" in the table above (fisheries stocks assessed by BFAR, of which 88.6% are overfished) are completely unrelated things that happen to share the number 166. Conflating them produces the nonexistent claim that "88.6% of coral reefs are overfished."

That said, the point that "the national average coral cover in the 20% range corresponds to the Poor–Fair boundary" is solidly established from the two sources above.

Conversely, the fact that Panaon Island — at 60% cover (i.e., Good or above) — was upgraded to a national protected area precisely because it was "exceptional" itself speaks to how low the national standard is.

3. Bleaching (coral bleaching)

The Fourth Global Coral Bleaching Event (2023–2025)

NOAA NESDIS announced on 2 June 2026 that "the Fourth Global Coral Bleaching Event most likely ended in 2025."

Derek Manzello, coordinator of NOAA Coral Reef Watch, said, "We have now entered an era in which coral reefs bleach nearly every year" (NOAA NESDIS, 2026-06-02).

注 "Ended" does not mean "recovered." The same announcement explicitly states that sea temperatures remain elevated relative to levels 25–30 years ago.

2024 bleaching within the Philippines

New development in 2025–2026: Southeast Asia's first coral "cryopreservation bank"

注 "Very few cryopreserved larvae have been raised to adulthood" (Eos, 2025-12-05). As a technology, this is an insurance policy, not a recovery strategy.

4. Destructive fishing and enforcement

Dynamite fishing and cyanide fishing

Blast fishing and cyanide fishing are banned under the Fisheries Code (RA 8550, as amended by RA 10654), but crackdowns have continued into 2026.

注 Information circulating from Western Command Navy sources claims that "a Chinese fishing vessel was caught using cyanide" in October 2025, but this session could not reach a primary source for it, so it is treated as unconfirmed.

2026's biggest setback: the Supreme Court's ruling that the Vessel Monitoring System (VMS) is unconstitutional

(All of the above from Mongabay, 2026-08-19.)

Scale of past illegal fishing: 40,204 commercial vessels illegally entered municipal waters in 2020; 27–40% of the 2019 catch was illegal (worth roughly ₱62 billion); over 30,000 unregistered municipal fishing boats; and unreported commercial catch of 422,000 tons per year (Mongabay, 2021-06-30).

5. Marine Protected Areas (MPAs) and the "paper MPA" problem

The gap between numbers and effectiveness

This is the "paper MPA" problem. Although designated as protected areas by ordinance, most lack boundary markers, wardens, budgets, or enforced penalties, and fishing effectively continues. 注 Citing only the figure "the Philippines has over 1,500 MPAs" badly misrepresents the reality.

注 There are two separate counting systems (made explicit in the 2026-08-25 verification): §3-3 of the field "Environment and Biodiversity" clearly distinguishes between the national NIPAS protected-area system (251 sites, roughly 7.87 million ha as of 2026) and small-scale MPAs established by local governments under the Local Government Code and the Fisheries Code ("several thousand" sites). This section's "over 1,500" (Mongabay 2021) is a point-in-time figure centered mainly on the latter, and 注 must not be added to the NIPAS protected-area count (251). When writing "the Philippines has ◯ MPAs," always attach whether it means 〈the national NIPAS system or LGU-established small-scale MPAs〉, 〈the year〉, and 〈the compiling body〉. Neither "over 1,500" nor "several thousand" has been deleted.

2025 progress: new designations and upgrades

As of February 2026, Associate Professor Rene Abesamis of UP Diliman (a 2024 Pew Marine Fellow) has, since 2024, been conducting a survey in the South Negros Marine Key Biodiversity Area to identify "climate-resilient reefs" using coral diversity, larval recruitment, competing algae, and heat stress as indicators (Pew, 2026-02-17). Smart buoys are used to measure water temperature.

注 Mongabay (2025-12) states that "9.9% of the world's oceans are designated as protected areas, but fewer than 3% are effectively managed." Note that this is not a problem unique to the Philippines but a global trend.

6. Tubbataha Reefs Natural Park

An offshore atoll in the middle of the Sulu Sea, part of the municipality of Cagayancillo, Palawan Province. The "flagship" of Philippine marine conservation.

注 Two different area figures circulate — 96,828 ha and 97,030 ha. UNESCO uses the former; the park itself uses the latter. Which one is used should always be paired with its source. (In the 2026-08-25 verification, the UNESCO original source was re-obtained, confirming 96,828 ha / listed 1993, boundary changed 2009 / criteria (vii)(ix)(x) / over 360 coral species = roughly 90% of the country's total / roughly 700 fish species / 11 cetacean species, 11 shark species, 7 breeding seabird species. Source: https://whc.unesco.org/en/list/653/)

Groundings and management status (latest developments in 2026)

At Tubbataha, roughly 30% of the marine debris collected is said to originate from neighboring countries (park management office). Even a fully no-take zone in the open ocean cannot escape transboundary plastic.

注 Historically, in 2013 there was a grounding incident involving the US Navy minesweeper USS Guardian and, separately, a Chinese fishing vessel, which is known to have led to tightened penalties, but this session could not reach a primary source, so details such as the fine amounts remain unconfirmed.

7. Apo Island — the prototype of community-led MPAs

A small island off the town of Dauin, Negros Oriental Province. It has become a classic case study in marine protected area research as the place where the approach of "residents deciding on and enforcing their own no-take zones" was globally proven effective.

Angel Alcala of Silliman University and colleagues became involved from the late 1970s, and islanders voluntarily established a no-take zone. Its effects have been repeatedly verified in peer-reviewed papers (confirmed via Crossref).

The lesson of Apo Island is that "a no-take zone does not take fishing grounds away from fishers — it increases catch in the surrounding areas." This became the theoretical foundation for the community-based MPAs (over 1,500) that later spread across the Philippines. 注 That said, as noted in the previous section, the effectiveness rate when the same approach was scaled up nationwide was only about 1/3, and the 2020s assessment is that "the Apo Island model succeeded but did not scale."

Tourism pressure is now a new challenge; in January 2023 environmental groups voiced concerns about the construction of a floating pier (Inquirer, 2023-01-10).

8. Whale sharks — Donsol vs. Oslob

The Philippines is said to have over 1,950 photo-identified individual whale sharks, and LAMAVE (the Large Marine Vertebrates Research Institute Philippines) describes it as home to "the world's second-largest whale shark population." The IUCN upgraded the species to Endangered in 2016 (a decline of over 50% across three generations).

注 How to handle the ranking (noted in the 2026-08-25 verification): this "world's second" metric refers to "the cumulative number of individuals identified through photo-ID in Philippine waters," not an estimate of the actual population, nor an encounter rate. It is a metric that depends heavily on identification effort (years of study, number of monitoring sites), so countries with more advanced surveys naturally show higher counts. In the 2026-08-25 verification, the relevant page on LAMAVE's official site could not be reached (404), so neither "over 1,950" nor "world's second" could be primarily confirmed = unconfirmed. 注 If citing the ranking, always attach the three elements 〈based on identified individuals〉〈LAMAVE〉〈year〉, and never write an unqualified "world's second."

Scientific criticism of Oslob (LAMAVE's 8-year study, 2012–2020)

Related papers: Schleimer, A. et al. (2015) PeerJ, "Learning from a provisioning site: code of conduct compliance and behaviour of whale sharks in Oslob, Cebu, Philippines" (DOI: 10.7717/peerj.1452); Araujo, G. et al. (2016), "Temperature-depth-recorder tags reveal modified diving behaviour…"; Ziegler, J.A. (2016), "Human dimensions of whale shark provisioning in Oslob"; and others (confirmed via Crossref).

Economics: According to Commission on Audit (COA) documents, Oslob reportedly earned 182 million pesos in whale-shark tourism revenue (Cebu Daily News, 2020-07-03). During the pandemic, losses reached 35 million pesos (Inquirer, 2020-07-18). This is not a "conservation vs. livelihoods" conflict but a "conservation vs. enormous local revenue" conflict — which is why this dispute has gone unresolved for nearly 20 years.

New development in 2026: the uproar over whale sharks "disappearing" from Oslob

In May 2026, whale sharks stopped appearing at Oslob for a sustained period, generating extensive coverage.

注 The greatest vulnerability of provisioning-based tourism is that "the local economy stops the moment the animals stop showing up," and the 2026 uproar should be treated as a case in which that risk materialized.

A third path: Southern Leyte (Panaon Island)

LAMAVE rates Southern Leyte (Panaon Island) as the most sustainable model. It has identified over 330 individuals, combined with alternative livelihood development through women's handicrafts. The Protected Seascape designation under Republic Act No. 12238 (29 August 2025, 61,204 ha) noted earlier gives this area a legal foundation.

注 Figures differ by source (2026-08-25 verification): for the number of identified individuals, this article gives over 330 (LAMAVE), while §3-3 of the field "Environment and Biodiversity" gives over 350. This is a metric that moves over time as identification work continues and the cumulative total grows. 注 Neither figure has been deleted. When citing it, always write it as "the cumulative total identified by LAMAVE as of month/year." In the 2026-08-25 verification, the relevant page on LAMAVE's official site could not be reached (404), so which figure is more current could not be determined.

注 Direct impact of the 2026 Middle East conflict

The fuel-price spike caused by the Middle East conflict that began on 28 February 2026 has directly struck Philippine marine tourism and fishing.

• 2026-03-31: Donsol cancels its Butanding (whale shark) Festival, citing the sharp rise in fuel prices (Inquirer)
• 2026-03-31: Rising fuel prices worsen debt among fishers and farmers (Inquirer)
• 2026-04-06: "The Iran war is pushing the Philippines' fishing villages to the brink" (The New Humanitarian)
• 2026-04-07: The government announces fuel subsidies of 5,000 pesos for farmers and 3,000 pesos for fishers (GMA Network)
• 2026-04-09: More fishing operators halt operations due to high fuel costs (Rappler)
• 2026-05-22: Fishers across Southeast Asia are being squeezed by fuel costs (BusinessWorld)

注 A conservation paradox: fishers unable to operate offshore due to high fuel costs risk concentrating fishing pressure on coastal reefs. Any 2026 conservation discussion needs to factor this in.

9. Mangroves and seagrass beds (blue carbon)

注 Regarding total national mangrove area and total seagrass area, this session could not reach primary statistics, so these are treated as unconfirmed. Figures such as "mangroves have halved from 450,000 ha in the early 20th century" or "the Philippines has 18 seagrass species, ranking second in the world" circulate in Japanese-language sources, but often the source year is old or the origin is unclear. 注 When citing such figures, always check the original tables from NAMRIA, DENR-FMB, or Global Mangrove Watch.

10. Ocean plastic and the EPR Act (RA 11898)

The origin of the claim that "the Philippines is a top emitter," and criticism of it

注 Three points that trip people up 1. Jambeck 2015 and Meijer 2021 use different metrics. The former measures "the volume of mismanaged plastic waste on land"; the latter, "outflow from rivers into the ocean." It is natural for the rankings to differ, and it is a mistake to conflate them and write "the Philippines is both first and third." 2. Meijer 2021 is a model estimate, not a direct measurement. The paper itself states its method as "estimating the probability that waste reaches waterways and flows into the sea, based on distributional data for plastic waste, land use, wind, and precipitation." Estimated values and confirmed values should be distinguished. 3. The fact that the Philippines' per-capita plastic consumption is lower than in developed countries yet it still ranks among top emitters stems from structural factors: ① as an archipelagic nation most of the population lives near water, ② heavy rainfall, ③ underdeveloped waste-collection networks, and ④ the prevalence of single-use sachets. 注 Framing the ranking as reflecting "low morals among Filipinos" is incorrect, and there is genuine local pushback against reporting of this kind. This session could not reach primary sources for academic rebuttal papers, so identifying specific critical papers remains unconfirmed.

The EPR Act (Republic Act No. 11898, 2022)

Statutory plastic-footprint recovery targets

Penalties

Whichever is higher between double the cost of the uncollected shortfall and the above fines is imposed. (All confirmed from the text of RA 11898 as reproduced on LawPhil.)

Implementation in practice (2023 → 2026)

注 The improvement from a 17% compliance rate in 2023 to "over 1,000 companies achieving" in 2026 is a fact, but 注 "exceeding targets" applies only to registered, reporting companies — it is not proof that national leakage, including from unregistered companies, has decreased. This is the point behind the June 2026 Inquirer article stating that "leakage continues."

注 Caution on what "over 1,000 companies" actually means (made explicit in the 2026-08-25 verification): §4 of the field "Environment and Biodiversity" states that as of end-2025, 1,017 enterprises (obligated enterprises, cooperatives, and PROs) were registered with the National Ecology Center, and 201 EPR programs were approved. "The number of enterprises registered (1,017)" and "the number of companies that met their collection targets (over 1,000, per DENR's 2026-04-17 announcement)" are different metrics, and are easily confused because the figures are close. 注 The same field further states that 155 companies were issued show-cause orders in August 2026, so "over 1,000 achieving = nearly all companies compliant" does not follow. Do not cite "over 1,000 achieving" alone without stating the denominator (the total number of obligated registrants).

11. Coral reef destruction in the South China Sea (West Philippine Sea)

September 2025: China's declaration of a "nature reserve" at Scarborough Shoal

(AMTI/CSIS, 2025-09-18)

注 A point that trips people up: it is inaccurate to explain South China Sea coral reef destruction solely in terms of "China's artificial island construction." By area, destruction from giant clam harvesting (approx. 16,350 acres) is 2.6 times larger than that from reclamation (6,200 acres) (AMTI estimate). Land reclamation is conspicuous, but the more extensive damage comes from the physical excavation of reefs by fishing boats.

12. Summary — a checklist for handling this field

日本語の詳細版: 分野「災害・環境・気候」「フィリピンのサンゴ礁と海洋保全 ── 生物多様性の「中心の中心」で起きていること」（本サイト日本語版）。