Sabah Marine Biodiversity 2026 — Coral & Fish Data

Sabah: The Coral Triangle’s Western Edge

Sabah’s marine domain sits at the western frontier of the Coral Triangle — the world’s most biodiverse marine region. The Coral Triangle spans 6 nations (Indonesia, Philippines, Malaysia, Brunei, Timor-Leste, Papua New Guinea) and encompasses approximately 76% of the world’s coral species and 37% of all reef fish species. Sabah’s waters contribute significantly to this global diversity hub.

Sabah’s marine biodiversity is driven by:

• Warm tropical waters (27.1–29.5°C): NOAA Coral Reef Watch puts Sabah sea surface temperatures between 27.1°C in February and 29.5°C in June. The coral bleaching threshold is 30.5°C.
• Ancient reefs: Some reefs are millions of years old, allowing complex ecological communities to develop.
• Nutrient-rich currents: Ocean currents deliver plankton and nutrients, supporting high primary productivity.
• Varied habitats: Coral walls, sandy bottoms, seagrass beds, mangrove nurseries — each supports distinct communities.
• Limited human impact (historically): Remote offshore reefs escape destructive fishing and coastal development.

Coral Reefs & Biodiversity

The Coral Triangle holds 605 coral species — about 76% of all known coral species (WWF). That is a six-country figure covering roughly 5.7 million km², and Sabah is one part of it; no state-wide coral count has been published for Sabah on its own. Sabah Parks records over 200 coral species across the waters it manages. Coral types include hard corals (Acropora, Porites, Goniopora) and soft corals (sea fans, leather corals, gorgonians). Reef structures range from shallow branching corals to deep-water walls.

Fish diversity is extraordinary. The Coral Triangle holds 2,228 reef fish species, about 37% of the world total (WWF) — again a six-country figure. No Sabah-wide reef fish count has ever been published; the honest numbers are the park-level counts above. Major families include:

• Groupers: Giant, leopard, coral trout — high-value food fish, now heavily fished.
• Snappers: Red snapper, emperor — economically important.
• Jacks & trevally: Fast predators that school in large numbers around reefs.
• Sharks & rays: 68 shark species; manta rays, eagle rays common.
• Butterflies, damsels, wrasses: Small reef fish that constitute reef abundance.
• Parrotfish & surgeonfish: Herbivores critical for reef health.

Marine Protected Areas

Tun Mustapha Park alone covers 898,763 hectares, making it Malaysia’s largest marine park. Sabah Parks’ total protected marine area is reported at around 2 million hectares, though a single audited state-wide figure is not published. Major marine parks include:

• Tun Sakaran Marine Park (35,000 ha, est. 2004): 8 islands, 528 reef fish species, 255 coral species. 73,573 visitors in 2025. Excellent for snorkelling and beginner diving.
• Tun Mustapha Park (898,763 ha, est. 2016): Malaysia’s largest marine park. Includes Mantanani Islands, seagrass beds, whale shark hotspot (seasonal). Vast shallow waters; less developed for diving than Tun Sakaran.
• Tunku Abdul Rahman Park (about 50 km², est. 1974): Five islands off Kota Kinabalu. Day-trip beaches (Manukan, Sapi, Mamutik, Sulug, Gaya). 573 fish species recorded. Sabah’s most-visited park, with 546,383 visitors in 2025.
• Turtle Islands Park (1,740 ha, est. 1977): Malaysia’s largest sea turtle rookery. Green and hawksbill turtles nest March–October — these are the only two species that nest regularly in Sabah. Limited visitor access, by Sabah Parks booking only.
• Sipadan Island Park (16,860 ha): Declared a marine park in 2004, with the island's land parcel gazetted in 2009 and the surrounding reef in 2015. One of the world’s top dive sites. The island itself is only about 12 hectares; the protected reef around it covers 6,847 hectares. Over 300 fish species per Sabah Parks. No accommodation on the island since 2004 — day visits only, capped at 252 permits a day, booked through licensed operators.

These protected areas function as fish nurseries and breeding grounds. Large fish biomass in no-take zones "spills over" to adjacent fishing areas, supporting commercial fisheries. Protection also allows coral recovery from bleaching and destructive practices.

Marine Threats & Climate Impacts

Key threats:

• Coral bleaching: Warm water stress causes corals to expel symbiotic algae, turning white. Malaysia’s mass bleaching years are 1998, 2010, 2016 and 2024. The 2024 event was the worst recorded: Reef Check Malaysia surveys found 50.7% of corals bleached and 34.1% mean mortality. Bleached corals can recover if conditions normalise quickly, but repeated events cause mortality.
• Overfishing: Groupers, snappers, and sharks are heavily targeted. Herbivorous fish (parrotfish, surgeonfish) removal disrupts reef health — macroalgae overgrow when herbivores are depleted.
• Crown-of-thorns starfish: Outbreaks consume live coral rapidly. Linked to nutrient enrichment and depletion of predatory species that normally keep starfish in check.
• Sedimentation: Forest clearing and coastal development cause runoff that smothers corals and reduces light penetration.
• Ocean acidification: Lower pH reduces coral calcification rates and weakens shells of mollusks and crustaceans.

Marine protected areas reduce vulnerability to these stressors by maintaining high fish biomass, allowing coral recovery, and buffering against edge effects. Spillover from no-take zones supports nearby fisheries, creating economic incentive for long-term protection.

Diving Tourism & Visitor Statistics

No published figure exists for the number of divers visiting Sabah each year. Sabah Parks publishes total park visitors, not a breakdown by activity, and no tourism body publishes a diver count. Where you see one quoted, it is an estimate. What is published:

• Sipadan: access is capped at 252 permits a day for divers and snorkellers combined, shared across all licensed operators (Sabah Tourism Board). No annual visitor figure is published. Permits sell out months ahead and can only be applied for by a licensed operator.
• Tun Sakaran: 73,573 visitors in 2025. Reached from Semporna. Day trips and liveaboards, beginner-friendly, excellent snorkelling.
• Tunku Abdul Rahman Park: 546,383 visitors in 2025, Sabah's most-visited park. Day trips from Kota Kinabalu — beaches and snorkelling, with some diving. High traffic, strictly managed.
• Mabul and Kapalai: macro diving, critters, house reefs. Privately leased resort islands, so no park visitor count is published.

Frequently asked questions