Why are isolated, non-migratory populations such as the Arabian Sea humpback whale especially vulnerable? Suggest conservation measures.

Most humpback whales migrate between polar feeding grounds and tropical breeding grounds. The Arabian Sea humpback does not. It stays in one sea all year and is treated as a separate Distinct Population Segment listed as endangered [3]. The IUCN rates it Endangered [4]. Because it is isolated, a threat that would only be local for other whales can threaten this whole population.

Why isolation increases vulnerability

• Closed gene pool: No whales arrive from other populations to make up for losses. This leads to low genetic diversity and inbreeding, so the population adapts poorly to disease or change.
• Small numbers: Each adult death matters for the population's future. A few deaths a year from human causes can push it into decline, and a group this small also risks the Allee effect (too few animals to find mates and breed successfully).
• Nowhere to escape: The whales feed and breed in the same waters, so they are exposed to local pressures all year. Fishing nets are one of the main pressures; MoEFCC estimates 9,000–10,000 cetaceans are caught as bycatch in India every year [1]. Busy shipping lanes add the risk of ship strikes and underwater noise.
• Food depends on the monsoon: The whales rely on prey from monsoon-driven upwelling. If climate change weakens upwelling, the whole population loses food at once.
• Weak monitoring: Few strandings are recorded and identified, so a decline can go unnoticed.
• Shared waters: The range crosses several national borders, so no single country's law covers the whole population.

Conservation measures

• Legal: Enforce Schedule I protection under the Wildlife (Protection) Act, 1972 [5]. Notify critical habitats and marine protected areas along the west coast.
• Cut bycatch: Modify fishing gear, set seasonal no-net zones and compensate fishers, in line with the 2021 Marine Megafauna Stranding Management Guidelines [1].
• Stranding response: Train fishers, panchayats and students using the WII stranding-response manual [2]. Add a single public hotline and a national stranding database.
• Science: Use passive acoustic monitoring, photo-identification and genetic sampling to track numbers.
• Shipping: Set speed limits and shift shipping lanes away from whale hotspots.
• Regional cooperation: Agree a joint Arabian Sea action plan with other coastal states through the CMS and the IWC.

Taken together, the risks come from small numbers, isolation and threats concentrated in one sea. Law alone cannot address them. Protection needs to be paired with community watchers, scientific monitoring and cooperation across borders. This would help meet SDG 14 (Life Below Water) and the duty in Article 51A(g) to protect wildlife.