A rare underwater formation of orange, white, and green corals photographed off Minicoy island in Lakshadweep is giving scientists at the ICAR-Central Marine Fisheries Research Institute (CMFRI) fresh insight into why some coral colonies withstand rising sea temperatures while others do not. The sighting, captured during a marine mammal survey, has been described by researchers as a natural experiment in thermal stress tolerance.

What Was Spotted

The formation was photographed by CMFRI research scholar Alvin Anto and features two distinct species: Lobophyllia corymbosa, displaying vibrant orange hues, and Lobophyllia radians, appearing in both white and green. What has particularly drawn scientific attention is the contrasting condition of two neighbouring colonies of L. radians growing virtually side by side. One colony has undergone bleaching — having lost its symbiotic algae — while the other remains visibly healthy and green despite experiencing identical environmental conditions.

Why This Matters for Coral Science

Coral bleaching occurs when environmental stress, chiefly elevated sea temperatures, forces corals to expel their symbiotic algae. These algae provide corals with the bulk of their energy and pigmentation. Prolonged bleaching can ultimately lead to coral death, making bleaching events one of the most visible markers of climate-driven marine degradation.

The Minicoy observation is significant precisely because it presents a natural side-by-side comparison of the same species responding differently to the same stressor — a scenario that is difficult to replicate under controlled laboratory conditions. Researchers say this could yield valuable data on the genetic or physiological traits that confer thermal resilience in certain coral colonies.

What CMFRI Scientists Said

CMFRI Director Dr Grinson George said the formation carries meaning beyond its visual appeal. 'This is not merely a symbol of India's rich marine biodiversity. It tells the story of both resilience and vulnerability to climate stress,' he said. Dr George added that the contrasting response of the two neighbouring colonies could provide valuable insights into thermal stress tolerance, with potential applications in coral reef restoration and climate adaptation research.

CMFRI's Broader Conservation Push

The institute is simultaneously scaling up efforts to strengthen marine ecosystems against climate pressures. With support from the Centre, CMFRI is expanding artificial reef deployment along coastal waters to revive degraded habitats, enhance biodiversity, and support artisanal fishing communities. Parallel programmes on fish breeding, seed production, and sea-ranching are also under way to replenish depleted marine resources.

According to Dr George, restoring natural habitats through artificial reefs can contribute to building more climate-resilient marine ecosystems over the long term. The colourful assemblage off Minicoy has, in that sense, delivered something more enduring than a striking photograph — a natural clue that could shape how scientists approach coral conservation as warming seas put reef systems under accelerating pressure.