Reef Manta Ray (Mobula alfredi)
Reef Manta Ray (Mobula alfredi) in an approved source image used for species identification.
- Creator
- Jaine FRA, Couturier LIE, Weeks SJ, Townsend KA, Bennett MB, et al. (2012)
- License
- CC BY 2.5
Reef Manta Ray (Mobula alfredi)
Status: needs expert review. A science reviewer should confirm the current IUCN category, assessment date, and decline estimates before approval. The reef manta ray (Mobula alfredi) is a large, filter-feeding ray of tropical and subtropical coastal reefs in the Indian and West Pacific Oceans.
At a glance
| Field | Value | Source |
|---|---|---|
| Scientific name | Mobula alfredi | IUCN Red List |
| Guild | shark-ray | — |
| IUCN status | Vulnerable (assessed 2019; version 2020-1) | IUCN Red List |
| Population trend | Decreasing | IUCN Red List |
| Range | Tropical and subtropical Indian and West Pacific Oceans, mainly coastal reefs | Manta Trust |
| Disc width | Commonly ~3–3.5 m across | Manta Trust |
Identification
The reef manta ray is a very large ray with a kite-shaped disc, broad wing-like pectoral fins, and a pair of long, flexible cephalic ("head") lobes flanking a wide, terminal mouth. Individuals carry unique natural spot patterns on the underside that allow photo-identification of individual animals over many years. Females reach significantly larger disc widths than males (Manta Trust). The reef manta is distinguished from the larger oceanic manta ray (Mobula birostris) by coloration patterns and its more coastal habits.
Ecology and behavior
Reef manta rays frequent relatively shallow coastal reefs, where they filter-feed on zooplankton and visit cleaning stations. They display strong site affinity, with the same individuals re-sighted at coastal areas across many years; one individual was documented 11 times over a 30-year period, according to research compiled by the Manta Trust (Manta Trust). The species has an extremely slow life history, producing on average only about one pup every several years, giving it one of the lowest reproductive rates among elasmobranchs (IUCN Red List). Behavioral specifics should be cited to published research and confirmed in review.
Conservation status and threats
The IUCN Red List assesses the reef manta ray globally as Vulnerable (assessed 2019, published in version 2020-1), with a decreasing population trend. Targeted and bycatch fisheries — driven largely by demand for the gill plates used in some traditional-medicine markets — combined with the species' slow growth, late maturity, and very low fecundity have produced steep regional declines (an estimated ~70% over recent decades in some regions). Where the species is protected, such as in Australian waters, some populations are suspected to be stable (IUCN Red List; Manta Trust).
Documented threats include:
- Targeted fishing for gill plates
- Incidental capture (bycatch) in commercial fisheries
- Disturbance at predictable coastal aggregation areas, including from unmanaged tourism
- Climate-driven shifts in zooplankton prey availability
Report figures as the cited authorities state them; a reviewer should confirm subpopulation specifics.
How to observe responsibly
This page does not provide approach guidance. Reef mantas aggregate predictably at coastal sites, which makes those locations sensitive — this page keeps them at regional granularity only (ETHICS.md). Any in-water encounter must follow a reviewed observation guide and local regulations: maintain distance, do not touch, chase, block the swimming path of, or crowd the animals, and follow recognized manta-watching codes of conduct. Choose operators committed to no-touch, distance-first practice.
How you can help
- Contribute photo-ID images of individual rays to recognized manta research databases where invited, following each program's protocol.
- Support gill-plate trade reduction and manta protection through credible organizations such as the Manta Trust.
- Choose tourism operators that follow manta codes of conduct and limit in-water numbers.
Sources (2)
Every claim in this artifact traces to one of the citations below. Anything that could not be sourced was left out.
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