An Arabian Sea humpback whale has crossed the Arabian Sea to Goa. The animal, tagged off Oman’s coast, travelled over open water for more than a month, marking the first documented long‑distance movement for the species. This journey is considered a behavioral anomaly because these whales are uniquely adapted to their habitat.
First long‑distance movement recorded Arabian Sea humpback whales diverged from Southern Hemisphere populations around 70,000 years ago, radically changing their foraging strategy to remain in one place.
Researchers deployed 14 satellite tags at Hallaniyat Bay, a marine sanctuary about 50 km off the Omani coast, and in the Gulf of Masirah on the eastern shore. The tags transmitted for an average of 53 days, delivering more than 1,800 location points. Six of the animals tagged in Hallaniyat Bay remained within a 400 km radius, while one female broke the pattern and headed toward Goa, India.
About 80 humpback whales live in Omani waters, and the population is classified as endangered.
Until now, scientists believed this group was the only humpback whale population that did not undertake seasonal migration. The new data shows that at least one individual can travel the full width of the Arabian Sea, suggesting the possibility of undiscovered habitats beyond Oman’s coastline.
“Up to this point there was no direct evidence of whales moving the long distances across the ocean basin,” Dr Andrew Willson said. — Dr Andrew Willson, Marine Scientist and Founding Director of Future Seas Global SPC
Implications for humpback ecology: Willson explained that the whale’s movements likely reflect a search for food, such as sardines along the continental shelf, or deeper‑water prey like krill. Due to monsoons, the western Arabian Sea is one of the most productive upwelling zones globally, where deep nutrient‑rich water rises to the surface like an oceanic fertiliser and can support whales year‑round.
The findings were published in Frontiers in Marine Science, where the authors noted that documenting a cross‑basin journey “points to the possibility of other important habitats.” The study allowed scientists to overcome the challenges of observing these elusive animals. Researchers noted they previously only got fleeting glimpses during long hot hours of boat surveys. Tagging the whales allowed the team to “peel back the lid of the sea” and check online to see where they were each day, revealing details about their daily life that were previously inaccessible.
Frequently asked questions
What is the significance of the Arabian Sea humpback whale crossing to Goa? It marks the first documented long‑distance movement for the species, challenging the previous belief that Arabian Sea humpback whales do not migrate.
How did scientists track the whale's journey? Researchers deployed satellite tags in Hallaniyat Bay and the Gulf of Masirah; the tags transmitted location data for an average of 53 days, providing over 1,800 points that revealed a crossing to Goa lasting about a month.
Why is this whale population endangered? The Arabian Sea humpback whale population is estimated at about 80 individuals and is classified as endangered.
What does the whale's movement suggest about its habitat? The crossing implies there are undiscovered or under‑studied habitats beyond Oman’s coast, indicating the population may use a broader range than previously thought.
What food sources might drive the whale's migration? The whale likely follows prey such as sardines along the continental shelf or deeper‑water krill, attracted by the nutrient‑rich upwelling zones of the western Arabian Sea.
