A community-led marine biodiversity registry in Thiruvananthapuram is doing more than cataloguing life beneath the city’s coastal waters. By combining 200 videos, 6,000 images and the knowledge of fisherfolk, the online platform is making visible an underwater environment that formal records have not fully captured, while also documenting changes associated with activity along the coast.
Compiled by Friends of Marine Life (FML), the Community Marine Biodiversity Online Registry records more than 2,000 marine species found off Thiruvananthapuram. Its database includes 519 fish, more than 80 varieties of crabs, 60 sea sponges, 26 seabirds and 110 sea worms, along with corals, mollusca, arthropods, starfish, seaweeds, ascidians, bryozoans and marine insects.
The registry is significant because it treats biodiversity documentation as a community exercise rather than a process limited to formally identified species. Its creators say it is believed to be the first community initiative of its kind to track, document and identify marine biodiversity off the coast by drawing on fisherfolk knowledge. That approach challenges a basic assumption behind conventional inventories: that an organism must first receive a scientific name before it can be recorded as part of an ecosystem.
The database includes several organisms whose scientific identities remain unresolved. These include 48 varieties of sea sponges, 74 coral subspecies, five jellyfish and three starfish, among other unidentified organisms. The lack of a scientific name has not prevented the registry from documenting their presence. Instead, the platform records them through images and local knowledge and invites the public to submit information that may help identify them.
Robert Panipilla of FML said the registry gives importance to local names because the organisms were found by fisherfolk at sea. The platform allows users to provide possible scientific identifications, after which the registry can be updated. This creates a record that can evolve as new information becomes available, rather than excluding species until the classification process is complete.
That distinction matters in a coastal city, where knowledge of the marine environment is distributed across institutions, researchers, divers and fishing communities. The organisms in the registry were documented during dives conducted by FML and Scuba Cochin off the city’s coast, as well as through examination of organisms caught by fisherfolk. Some were normally encountered as bycatch, while others were brought ashore alive.
The registry therefore functions as both a biodiversity archive and a record of how the coast is experienced at ground level. Fisherfolk are not merely sources of specimens. Their knowledge helps identify organisms that may otherwise remain unnamed or absent from official documentation. FML said the idea for the registry emerged after organisms caught and brought ashore alive by fisherfolk were left out of the state’s marine biodiversity register because their scientific names could not be established.
This gap reveals an institutional problem in environmental record-keeping. A register designed around formal identification can produce an incomplete picture when local observations are not integrated into the system. The issue is not only whether a species has been classified. It is also whether the administrative and scientific process is capable of recording what coastal communities already know exists.
The online platform also maps habitats rather than listing species in isolation. Its records cover algal, artificial reef, nearshore, offshore and shipwreck habitats. This provides a broader view of the coastal ecosystem by connecting organisms to the environments in which they are found. It also creates a basis for tracking changes in habitats, although the material supplied does not establish the duration or methodology of any long-term monitoring programme.
One of the most consequential records concerns the destruction of a sea-worm colony in waters nine metres deep between Azhimala and Adimalathura after dredging began for the Vizhinjam port project. The registry’s documentation links a specific underwater habitat change to infrastructure activity. It does not, in the material available, quantify the ecological impact beyond recording the destruction of the colony, but the entry demonstrates why coastal infrastructure cannot be assessed only through visible land-based works.
Ports and related dredging operations alter underwater spaces that are rarely part of everyday public view. A road project can be observed through traffic diversions, dust or construction barriers. Changes on the seabed are less visible, and their documentation depends on divers, fishing activity and sustained ecological observation. The registry brings that hidden layer of urban infrastructure into public view.
This does not turn the platform into a substitute for statutory environmental assessment or an official biodiversity register. Its value is different. It creates a publicly accessible evidence base, preserves observations that could otherwise disappear and offers a channel through which formal records may eventually be supplemented. The platform’s open invitation for people to identify species also makes the registry a participatory document rather than a closed inventory.
The division of responsibility is important. FML and divers are collecting and uploading observations. Fisherfolk contribute local names, knowledge and specimens. Members of the public can provide identification inputs. Formal authorities, meanwhile, remain responsible for official registers and for assessing infrastructure-related environmental changes under the relevant administrative processes. The supplied report does not state whether the registry has been formally integrated into government decision-making.
The data already assembled shows the scale of what can remain outside ordinary public understanding. More than 2,000 species, 200 videos and 6,000 images represent a substantial visual and descriptive record, even though some organisms remain unidentified. The numbers also show that marine biodiversity is not limited to a few recognisable fish or coastal habitats. It includes multiple groups of organisms and a range of environments extending from nearshore waters to offshore and artificial habitats.
At the same time, the database’s numbers should not be read as a complete measure of all marine life off Thiruvananthapuram. The report does not specify the total survey area, the number of dives, the period over which observations were made or the criteria used to count species and varieties. It also does not establish how the registry’s figures compare with the state’s marine biodiversity register. What the available evidence does show is that community observation has identified a wide range of organisms, including many that remain unresolved within formal scientific classification.
That combination of detailed documentation and unresolved identification is itself important. It shows that a record can be useful before every entry is scientifically settled. A photograph, location, habitat description and local name can preserve evidence for later examination. Without such a record, an organism may be absent from institutional data altogether, making future ecological comparison more difficult.
For Thiruvananthapuram, the larger urban question is how the city governs a coast that is simultaneously a livelihood system, an ecological space and a site of infrastructure development. The registry does not resolve that question, nor does the supplied material establish a policy response from authorities. It does, however, make the underwater consequences of coastal activity more legible.
The platform’s next significance will depend on whether its observations remain updated, whether unidentified organisms receive further scientific attention and whether its records are considered alongside official biodiversity documentation and infrastructure-related environmental monitoring. For now, the registry confirms that the city’s marine environment is considerably richer and less fully recorded than conventional public accounts suggest.
