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Bentota inshore reef micro-fragmentation: Biorock mineral accretion and Acropora growth rates?

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M
Marco Microfragment•920 rep

How do marine biologists use low-voltage electric currents across submerged steel cathode frames to accelerate calcium carbonate accretion on coral nurseries in Bentota?

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5 Answers from travellers

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Coral nursery projects in the sheltered rocky coves off Bentota and Induruwa utilize Biorock (mineral accretion technology) to fast-track reef restoration. Submerged welded steel rebar frameworks are connected to a shore-based low-voltage direct electric current (12V DC, 5 to 10 amps). Electrolysis draws calcium and magnesium ions out of seawater, precipitating solid crystalline brucite and aragonite limestone across the metal cathode. Transplanted micro-fragments of staghorn coral (Acropora muricata) cemented to the electrified steel frame grow three to five times faster than on natural substrate, showing 80% higher survival rates during marine thermal heatwaves.

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D
Dr Dharshani NARA•1910 rep

The electric current is non-hazardous to swimmers and attracts schools of juvenile damselfish and cleaner shrimp that graze smothering filamentous turf algae off the frames.

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M
Marco Microfragment•920 rep

Titanium anodes must be inspected quarterly to prevent sacrificial anode erosion from interrupting the cathodic polarization loop.

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C
Capt Roshan Sea•1720 rep

Once nursery fragments reach 15cm colonies, divers detach them using stainless steel chisels and transplant them onto natural degraded granite reefs.

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Sarah Field Scout•1720 rep

Coral fragments are collected exclusively as "corals of opportunity"—broken branches severed by boat anchors or storm swell that would otherwise die in sandy silt.

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P
Prof Gamhewage Bio•1950 rep

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