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The Similan Islands and Koh Bon stand out for coral-reef-surveys due to their pristine Andaman Sea ecosystems, boasting excellent reef health with no recent bleaching and unique corals like Seriatopora Hystrix found only here. Koh Bon's limestone ridges contrast the Similans' granite boulders, offering diverse survey sites from shallow bays to steep walls rich in marine biodiversity. Recent Department of National Parks surveys confirm thriving reefs supporting whales, dolphins, turtles, and over 50 fish species, making this a global benchmark for conservation monitoring.[1][2][6]
Prime survey spots include Koh Bon Ridge for manta cleaning stations amid sea fans, Similan pinnacles like East of Eden for hard coral cover, and bay bommies hiding lobsters and rays. Divers conduct belt transects or photo quadrats to assess live coral percentages, often joining liveaboard research trips. These sites suit all levels, with bays for snorkel surveys and ridges for advanced current work.[3][4][7]
Target November to April for flat seas, 20–30m visibility, and 26–29°C waters; avoid monsoon closure May–October. Prepare for variable currents with reef hooks and nitrox; liveaboards provide gear but bring personal dive computers. Follow no-touch protocols and join guided surveys for accurate data on recovery from 2010/2016 bleaching.[1][2][6]
Local Thai park rangers and Phuket-based research centers collaborate on annual surveys, fostering community-led conservation. Dive operators emphasize responsible practices, training visitors in sustainable surveying to aid long-term reef management. Insider trips often include data uploads to global databases, connecting enthusiasts with Thailand's marine protection efforts.[1][5]
Book liveaboard trips 6–12 months ahead for November–April season, as park permits limit daily visitors and slots fill fast. Target operators with citizen science programs for guided coral surveys using standardized protocols. Confirm recent reef health reports from Department of National Parks before committing, as conditions evolve post-bleaching events.
Arrive with PADI Advanced Open Water certification for Koh Bon drifts; rent survey slates onboard if needed. Pack reef-safe sunscreen and logbooks to record species like Gorgoniidae and sea turtles. Brief crews on no-touch survey rules to protect recovering corals.