Thiruvananthapuram’s marine biodiversity is being documented at a scale that formal systems appear to have missed. A community-led online registry has recorded more than 2,000 species, 200 videos, 6,000 images and several underwater habitats off the city’s coast, while also preserving fisherfolk knowledge about organisms that experts have not yet scientifically identified.
The Community Marine Biodiversity Online Registry, hosted at combor.org, has been compiled by Friends of Marine Life with support from divers and fishing communities. Its significance is not limited to the number of species listed. The registry offers a different way of understanding the coastal environment: not as an empty stretch of water available for infrastructure or extraction, but as a living system whose condition is observed through repeated encounters by people working at sea.
That distinction matters because formal biodiversity documentation often depends on organisms being scientifically classified. According to the report published by the Times of India, several organisms brought ashore by fisherfolk were left out of the state’s marine biodiversity register because their scientific names could not be established. The community registry has instead retained local names and descriptions, allowing documentation to continue even when taxonomic identification remains incomplete.
The result is a record that combines scientific observation, underwater photography and practical knowledge accumulated by fishing communities. The online register includes 519 fish species, more than 80 varieties of crabs, 60 sea sponges, 26 seabirds and 110 sea worms, alongside corals, mollusca, arthropods, starfish, seaweeds, ascidians, bryozoans and marine insects. It also records several unidentified organisms, including 48 varieties of sea sponges, 74 coral subspecies, five jellyfish and three starfish.
The unresolved identities are not a minor detail. They show how much of the coastal ecosystem remains poorly understood even when it is visible to people who regularly fish, dive or work near the shore. The registry records two varieties of prawns and several sea worms known to local fisherfolk, although their scientific names have not been determined. Robert Panipilla of Friends of Marine Life said the platform allows people to submit information that could help identify such species, after which the registry can be updated.
This makes the registry both an archive and an open documentation system. It does not wait for every organism to pass through a formal classification process before recording its existence. That approach is especially relevant in coastal environments, where development decisions may affect habitats that have not been fully mapped or named.
The registry also documents habitats rather than species alone. These include algal habitats, artificial reefs, nearshore and offshore areas, and shipwreck habitats. It records changes to underwater ecosystems as well, bringing a time dimension into what could otherwise become a static species catalogue. The material described in the report therefore points towards a broader coastal monitoring function, even though the registry is a community initiative rather than a government system.
The clearest infrastructure link is the reported destruction of a sea-worm colony in waters about nine metres deep between Azhimala and Adimalathura after dredging began for the Vizhinjam port project. The report does not establish the full ecological impact of that loss, but the incident illustrates the problem that the registry is positioned to reveal: construction activity can alter habitats that may not be adequately represented in official inventories before work begins.
Dredging changes the physical conditions of the seabed and can affect organisms living within or on it. In this case, the registry’s value lies in recording a specific habitat and its reported destruction rather than making a general claim about all port-related impacts. The evidence supplied in the report does not quantify the extent of the damage, establish whether the colony can recover or compare the affected area with other sites. What it does show is that community documentation has captured an ecological change associated with a major infrastructure project.
That creates an institutional question for coastal governance. If an organism is excluded from a formal register because its scientific identity is unresolved, it may also be absent from the information used to understand environmental change. A local name does not replace scientific classification, but it can preserve evidence until classification is possible. The registry’s model suggests that these two forms of knowledge can operate together rather than being treated as alternatives.
The project also exposes a gap between the scale of urban infrastructure and the scale of ecological knowledge. Vizhinjam is an important port development, while the waters around Azhimala and Adimalathura form part of a working coastal landscape used and observed by fisherfolk. Decisions about dredging and marine construction therefore intersect with livelihoods, habitats and local knowledge. The material available in the report does not provide details of the project’s environmental approvals, monitoring arrangements or mitigation measures, so those questions cannot be resolved here. But the registry makes clear why such information needs to include underwater ecosystems that are not easily visible from land.
The numbers recorded by the platform further underline the limits of a surface-level view of the coast. More than 2,000 species have been entered, including hundreds of fish and numerous invertebrates, while the image and video archive makes the material accessible to people beyond the diving and fishing communities that generated it. The 200 videos and 6,000 images also provide a visual record of marine life that would otherwise remain largely invisible to residents of the city.
The registry’s reliance on fisherfolk knowledge is equally important. Local communities have recognised several organisms for years, even when formal systems could not assign them scientific names. This knowledge is not presented as a substitute for expert identification. Instead, it expands the pool of observations available for later verification. Panipilla said Friends of Marine Life gives importance to local names because the organisms were found by fisherfolk from the sea, while still inviting public inputs on scientific identification.
That approach raises a wider policy issue for biodiversity administration: what counts as evidence? A register built only around established scientific names may offer precision but leave gaps in coverage. A community register can provide broader observation but may require later expert validation. The Thiruvananthapuram platform shows the practical value of maintaining both layers, particularly where the pace of coastal development may exceed the pace of formal ecological documentation.
The registry also makes the coastline legible as a connected system. Its habitats range from nearshore and offshore waters to artificial reefs and shipwrecks, while the species catalogue spans fish, crabs, corals, sea sponges, seabirds and other organisms. This variety complicates the idea that a single coastal project affects only the immediate construction site. However, the supplied report does not provide enough evidence to map those connections or attribute wider ecosystem changes to any particular project.
What it does establish is more specific and arguably more useful: a community initiative has created a substantial public record of marine life, identified numerous gaps in scientific knowledge and documented at least one reported habitat loss associated with dredging for the Vizhinjam port project. Those facts place community monitoring alongside formal registers and project-level environmental processes as an important source of information about coastal change.
For Thiruvananthapuram, the larger urban question is whether marine biodiversity can be treated as part of infrastructure planning rather than as a separate conservation concern. The registry does not answer that question, and it does not by itself establish how its findings will influence official decisions. But it shows what becomes visible when fisherfolk, divers and community researchers document the sea continuously and publish the evidence openly.
The next step for the registry is continued identification, documentation and public updating. For authorities and infrastructure agencies, the material creates a resource that may help compare formal records with observations from the coast. What remains uncertain is how the documented species and habitat changes will be incorporated into official biodiversity registers, monitoring systems or future coastal decisions. Until that link is established, the registry will remain both a valuable public archive and a record of the information that conventional systems may overlook.
