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For identifying an individual humpback whale in a photo or video, look first for a clear view of the underside of its raised tail fluke. The unique pattern and serrations along the trailing edge are the strongest photo-identification clues. A photo may help identify a humpback or match it to a candidate individual, but appearance alone cannot usually establish that the whale belongs to the Arabian Sea population.
Start with the underside of the tail fluke
Humpback whale researchers use the underside of a raised tail fluke to distinguish individuals. The International Whaling Commission (IWC) says whales are recognized over time by “the unique serrations and patterns on the trailing edges and undersides of their tail flukes” (IWC humpback whale information).
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For a useful comparison, check how much of the trailing edge is visible and whether the fluke pattern is sharp, unobstructed, and well lit. A view from above shows the fluke’s topside, which the IWC photo-identification guide rates as a poor angle for this purpose; the underside is the preferred view. That guide was made for South Georgia and the Antarctic region, so treat its photography advice as general documentation guidance, not an Arabian Sea-specific protocol (IWC photo-identification guide).
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What counts as a possible match?
A resemblance is a candidate match, not proof. Compare the quality and angle of both images, the visible fluke markings, and how much of the trailing edge each shows. A distant, blurred, partly submerged, or topside-only view may not contain enough detail for a reliable individual comparison.
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Use the dorsal fin and video sequence as supporting evidence
The dorsal fin can provide another useful identifying view, especially when a photo or sequence clearly links it to the same whale as the fluke. The IWC identifies both the humpback’s fluke underside and dorsal fin as photo-ID features. A dorsal-fin image is most helpful as additional evidence; do not treat it as a substitute for a clear fluke view when the goal is individual matching.
Video can preserve continuity between views: for example, it may show the whale’s body, dorsal fin, and raised fluke during one encounter. A sequence helps reviewers assess whether those features belong to the same animal, but it cannot make an indistinct marking clear or establish a population origin by itself.
Keep species, individual, and population identification separate
Species identification
A fluke or dorsal-fin view can support identifying a whale as a humpback, but a single view may be incomplete. Describe what the image supports rather than claiming certainty from an indistinct or partial image.
Individual identification
Individual photo-ID means comparing distinctive markings across records to determine whether images may depict the same whale. It depends on comparable, sufficiently clear views and, for a confident identification, catalogue or researcher review.
Arabian Sea population attribution
The IWC describes Arabian Sea humpbacks as non-migratory and present in the region year-round. That is ecological context, not a visible field mark: an image’s appearance cannot establish where a whale belongs. Attribution needs evidence such as a reliable observation location and date, comparison with relevant catalogue records, or other research evidence.
A September 28, 2026, Wildlife Conservation Society announcement reported genetic evidence supporting a distinct evolutionary lineage and the potential recognition of a fourth humpback subspecies, Megaptera novaeangliae indica. The announcement says formal subspecies recognition is a decision for the Society for Marine Mammalogy’s Taxonomy Committee, so it should not be described as settled on the basis of that announcement alone (WCS announcement).
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Capture and preserve a useful record
These practices help retain evidence for later review. They are adapted from the IWC’s general photo-identification guidance, which is scoped to South Georgia and the Antarctic region.
- Prioritize the underside. When the whale raises its fluke, aim for the underside and a clear view of its trailing edge. Photograph the dorsal fin and body when possible.
- Record a short sequence. Photos or video that connect the fluke, dorsal fin, and body can help establish that the views belong to the same encounter.
- Keep the original files. Retain the highest-quality originals; do not crop, downsize, or delete them. Preserve date, time, and geolocation metadata when available.
- Save encounter context. Note where and when the record was made, approximate viewing conditions, and whether frames show the same encounter. Do not infer a catalogue match from one poor angle.
- Document injuries from a safe distance. If an animal appears injured or entangled, record visible scars or injuries only when it is safe to do so. Do not approach or interfere to improve a shot.
What scars and skin marks can—and cannot—show
Photos may document scars, skin conditions, or injuries, but a visible mark does not by itself prove how it occurred. In a 2022 study, Minton and colleagues assessed available Arabian Sea humpback images collected between 2000 and 2018, primarily in Oman. The percentages below describe those defined photo samples, not current prevalence across the entire population (Minton et al., Journal of Cetacean Research and Management, 2022).
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| Finding | Study sample and result |
|---|---|
| Tattoo-like skin disease | 43.4% of 83 adult whales in the available images had this condition. |
| Tattoo-like skin disease by image period | 51.7% in images from 2012–2018 versus 24.1% in images from 2000–2011. |
| Killer-whale tooth rakes | 12% of 77 individuals had rakes on the ventral surface of the tail flukes. |
| Scarring consistent with fishing-gear entanglement | 66.6% of 42 individuals represented by good-quality caudal-peduncle photos showed such scarring patterns. |
| Injuries consistent with vessel strikes | Four individuals had injuries the study considered consistent with vessel strikes. |
| Severe injuries or deformations likely caused by fishing-gear interactions | At least two other individuals had these findings. |
These are study observations and interpretations from available photographs. For example, scarring may be consistent with entanglement without proving the cause of a particular mark on an individual whale. The paper also discusses entanglement, ship strikes, and habitat degradation as threats; those conservation concerns are not visual traits that identify population membership.
Finding a catalogue or reporting a sighting
A historical Arabian Sea Whale Network report described an Oman humpback photo-ID catalogue curated by the Environment Society of Oman and linked to sightings data. It reported a maximum of 133 photographed individuals between 1985 and 2017; 83 had at least one good- or excellent-quality tail-fluke photograph. The report also noted that poor-quality fluke images and non-distinct dorsal fins could lead to possible duplicate entries. This is historical catalogue information, not confirmation of current access or submission eligibility.
The IWC guide directs contributors to Happywhale, but that guide concerns South Georgia and the Antarctic region. It does not establish Happywhale as an official intake route for Arabian Sea records. The sources cited here do not establish a current public submission channel for those records. Check current instructions with the relevant research organization before sending images, and do not assume that a photo will receive a match or response.
The IWC’s 2024 Scientific Committee recommendation calls for continued photo-identification and genetic data collection, expanded temporal and possibly spatial coverage, and use of data gathered since 2019 to update abundance and trend models and visual-health assessment (IWC Recommendation SC2451). This underlines why preserving image quality and encounter context matters to research beyond an individual sighting.
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