The giant oceanic manta ray (Manta birostris, widely treated as Mobula birostris) is afilter‑feeding mobulid that frequents upwelling fronts and outer‑reef cleaning stations and undertakes long‑range oceanic migrations.
Ecology & Life History
Feeding: zooplankton and small fishes via ram‑filtering with cephalic lobes channelling prey.
Reproduction: aplacental viviparous, typically a single pup; late maturity, very low fecundity (multi‑year intervals).
Behaviour: surface breaches; slow circling at cleaning stations for parasite removal.
Identification
Very broad rhombic disc; roll‑up cephalic lobes; terminal mouth; dark dorsum and white ventrum with asymmetric black spots (photo‑ID); often with shoulder patches. Larger and more oceanic than the reef manta Mobula alfredi.
Size & Longevity
Disc width: 4–6 m commonly; exceptional to ~7 m+.
Weight: ~1,000–1,500 kg.
Life: ~30–50+ years.
Range & Habitat
Global in tropical–subtropical–warm‑temperate seas over outer shelves/slopes; associated with fronts, upwellings, seamounts and reef cleaning stations.
Threats & Conservation
Fisheries: bycatch/targeted catch; historical gill‑plate trade.
Vessel strikes & entanglement due to near‑surface behaviour and ghost gear.
Tourism disturbance: crowding/touching/feeding.
IUCN: Endangered (EN); CITES Appendix II. Priorities: speed limits/buffers at hotspots, bycatch mitigation & rapid live‑release, and protection of cleaning stations with responsible codes of conduct.
