A new study on the Arabian Sea finless porpoise has identified genetic differences from Pacific populations and found that only 23.4 per cent of the species’ potentially suitable coastal habitat is covered by recognised Marine Protected Areas or Important Marine Mammal Areas. Together, the findings point to two linked challenges for India’s coastal governance: the need to understand whether the Indian Ocean population is distinct, and the limited reach of existing conservation designations.
The research was conducted by scientists from the Zoological Survey of India and Pukyong National University in Busan. Their work combined DNA analysis, anatomical study and computer-based habitat modelling to examine the wide-ridged Indo-Pacific finless porpoise, Neophocaena phocaenoides, a marine mammal that remains relatively poorly studied in the Indian Ocean.
The immediate trigger for the research was the discovery of a naturally stranded finless porpoise at Kozhikode Beach in Kerala. After the animal died, ZSI scientists preserved it and later recovered, cleaned and assembled its bones into a complete articulated skeleton. The specimen is now permanently housed at the ZSI Western Ghat Regional Centre.
That sequence matters because the study was built around a physical reference specimen rather than observation alone. Scientists extracted its complete mitochondrial genome and compared the genetic data with information from Pacific populations. The results showed notable differences, suggesting that finless porpoises in the Indian Ocean may have a distinct population structure.
The researchers have not presented the finding as a final definition of a separate population. They said broader sampling across the Indian Ocean would be required to establish the extent and significance of the genetic differences. The limitation is important: a single stranded specimen can open a research pathway, but it cannot by itself describe the distribution, abundance or genetic variation of an entire marine population.
Even with that qualification, the study changes the conservation question. If Arabian Sea finless porpoises represent a distinct population structure, management decisions based primarily on knowledge of Pacific populations may not adequately reflect the ecological conditions or risks faced in the Indian Ocean. The evidence supplied in the study does not establish a new legal conservation classification, but it does underline the need for region-specific knowledge.
The second major finding is more directly connected to how coastal planning operates. Ecological modelling identified extensive areas along the region’s coast that could provide suitable habitat for the species. Only 23.4 per cent of those areas, however, fall within existing MPAs or IMMAs. In practical terms, most of the modelled suitable habitat lies outside the recognised conservation coverage cited by the researchers.
That percentage is not a measure of how much habitat is effectively protected on the ground. It is a measure of overlap between areas identified as potentially suitable and areas covered by the specified conservation designations. The distinction matters because formal designation, management capacity and enforcement are separate questions. The study establishes a coverage gap, but the supplied material does not provide site-level details about enforcement, staffing, budgets or compliance within the protected areas that do exist.
The finding nevertheless exposes a familiar weakness in coastal governance: conservation boundaries do not always follow the ecological geography of mobile marine species. A finless porpoise can move through waters that are also used for fishing, shipping, industrial activity and other coastal functions. Protecting only designated areas may therefore leave important parts of a species’ potential habitat subject to risks beyond the boundary of an MPA or IMMA.
The study identifies coastal industrial development, accidental capture in fishing gear, collisions with vessels and marine pollution among the principal human-induced threats. Each belongs to a different administrative and economic system. Industrial development is linked to coastal land-use decisions and project approvals. Fishing interactions involve the design and use of gear, fishing practices and monitoring. Vessel collisions raise questions about marine traffic and operating areas. Pollution requires coordination across local, state and national authorities and across multiple sources.
This fragmentation is central to the urban and infrastructure significance of the research. Coastal cities and industrial regions are not separate from marine ecosystems; their ports, shorefronts, fishing economies, treatment systems, construction activity and transport networks shape the waters around them. A species affected by vessel movement, coastal development and pollution sits at the intersection of conservation policy and the built environment.
The study does not attribute any particular threat to a named project, city or agency. It also does not quantify mortality from fishing gear, vessel collisions or pollution. Those limits prevent the findings from being used as a direct assessment of any single coastal development. What the research provides is a regional warning that suitable habitat may extend beyond the areas currently recognised for marine conservation, while several human pressures operate across those wider waters.
The institutional response described in the report is centred on scientific documentation and collaboration. Manokaran Kamalakannan, the ZSI scientist who led the recovery and documentation of the specimen, said the Kozhikode stranding created a rare opportunity to study the species in the Arabian Sea. He said preserving the animal as a complete skeleton would allow it to serve as a long-term resource for scientific research and education.
Shantanu Kundu, Associate Professor at Pukyong National University, said the collaboration combined India’s field taxonomy and specimen-collection expertise with South Korea’s expertise in genetic analysis and ecological modelling. The partnership illustrates how evidence about poorly studied species may depend on combining museum collections, field documentation, laboratory genetics and habitat modelling rather than relying on one method.
ZSI Director Dhriti Banerjee said the reference specimen demonstrated the importance of zoological collections in documenting India’s marine biodiversity and strengthening conservation research. Vishwanath D Hegde, Scientist and Officer-in-Charge of the ZSI Western Ghat Regional Centre, said the skeleton would help students and researchers understand marine mammal anatomy and encourage greater awareness of coastal conservation.
These statements also clarify what the study can and cannot do institutionally. A preserved specimen can support future identification, education and comparative research. Genetic analysis can indicate differences between samples. Habitat modelling can identify areas that may be suitable. None of these tools, by themselves, creates a protected area or changes how a coastal project is approved. Translating the evidence into protection would require decisions beyond the research team.
The 23.4 per cent coverage figure provides the clearest data story in the study. It shows a substantial difference between modelled ecological suitability and recognised conservation coverage. The report does not provide the total area of suitable habitat, the number of MPAs or IMMAs involved, or a state-by-state breakdown. It also does not supply population estimates, historical trends or a count of strandings. The available evidence therefore supports a diagnosis of incomplete coverage, not a measurement of population decline.
That distinction is crucial for public understanding. A species can have habitat outside protected areas without an established decline, just as a high level of formal coverage would not automatically guarantee safety. The research identifies exposure and uncertainty together: significant coastal pressures have been listed, while the species’ Indian Ocean population structure and broader distribution remain insufficiently understood.
For coastal planners, the immediate structural question is whether marine conservation is being organised around fixed administrative boundaries or around the movement and habitat needs of marine species. The study suggests that the latter may require wider evidence and more coordinated planning. It does not prescribe a particular policy instrument, and the supplied material does not establish whether any new designation, monitoring programme or regulatory change has been announced.
The next stage is therefore scientific as well as administrative. Broader sampling across the Indian Ocean is needed to determine the extent and significance of the genetic differences identified in the study. Further work would also be needed to connect modelled suitable habitat with actual sightings, strandings, population distribution and specific human pressures. Until that evidence is available, the Arabian Sea finless porpoise remains a case in which conservation planning is being asked to act under incomplete knowledge.
The study’s most important conclusion is not that a new protected area has been created or that a separate population has been definitively confirmed. It is that a rare specimen has produced evidence of possible population distinctiveness at the same time as habitat modelling has revealed limited overlap with recognised conservation areas. For India’s coastal system, the issue now is whether research, planning and marine protection can keep pace with an ecosystem that extends beyond the boundaries of existing designations.
