The reef manta ray (Mobula alfredi) is a species of ray in the family Mobulidae, one of the largest rays in the world. Among generally recognized species, it is the second-largest species of ray, only surpassed by the giant oceanic manta ray.
The species was described in 1868 by Gerard Krefft, the director of the Australian Museum. He named it M. alfredi in honor of Alfred, Duke of Edinburgh, the first member of the British royal family to visit Australia. It was originally described as part of the genus Manta but in 2017 was changed, along with the rest of the mantas, to be included as part of the genus Mobula.
Reef manta rays are typically 3 to 3.5 m (9.8 to 11.5 ft) in disc width, with a maximum size of about 5.5 m (18 ft). For a long time included in M. birostris, the status of the reef manta ray as a separate species was only confirmed in 2009. The reef manta ray is found widely in the tropical and subtropical Indo-Pacific, but with a few records from the tropical East Atlantic and none from the West Atlantic or East Pacific. Compared to the giant oceanic manta ray, the reef manta ray tends to be found in shallower, more coastal habitats, but local migrations are sometimes reported.Mobula birostris is similar in appearance to Mobula alfredi and the two species may be confused as their distribution overlaps. However, there are distinguishing features.
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DiurnalDiurnal animals are active during the daytime, with a period of sleeping or other inactivity at night. The timing of activity by an animal depends ...
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PlanktivoreA planktivore is an aquatic organism that feeds on planktonic food, including zooplankton and phytoplankton. Phytoplankton are usually photosynthet...
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Filter feederOv
OviparousOviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive...
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PolygynandryPolygynandry is a mating system in which both males and females have multiple mating partners during a breeding season.
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SolitaryMi
MigratingAnimal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. It is the most common form of migrati...
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starts withThe reef manta ray can grow to a disc size of up to 5 m (16 ft) but average size commonly observed is 3 to 3.5 m (11 ft).It is dorsoventrally flattened and has large, triangular pectoral fins on either side of the disc. At the front, it has a pair of cephalic fins which are forward extensions of the pectoral fins. These can be rolled up in a spiral for swimming or can be flared out to channel water into the large, forward-pointing, rectangular mouth when the animal is feeding.The eyes and the spiracles are on the side of the head behind the cephalic fins, and the five gill slits are on the ventral (under) surface. It has a small dorsal fin and the tail is long and whip-like. The manta ray does not have a spiny tail as do the closely related devil rays (Mobula spp.).The color of the dorsal side is dark black to midnight blue with scattered whitish and greyish areas on top head.The ventral surface is white, sometimes with dark spots and blotches. The markings can often be used to recognise individual fish.Mobula alfredi is similar in appearance to Mobula birostris and the two species may be confused as their distribution overlaps. However, there are distinguishing features.
The reef manta ray has a widespread distribution in tropical and subtropical parts of the Indo-Pacific, with few records from the warm East Atlantic and none in the West Atlantic or East Pacific. It can be observed in several often-visited regions such as Hawaii, Fiji, French Polynesia, Micronesia, Bali, Komodo, Maldives, Mozambique, Australia and the Philippines. It is primarily found in coastal regions.
Reef manta rays live in a more or less identical wide area with the possibility of short migration to follow the zooplankton. They therefore have a relatively sedentary behavior with precise areas for cleaning and feeding still within close proximity of coasts, reefs or islands.
The reef manta ray has a pelagic lifestyle and feeds by filtering sea water in order to catch zooplankton.Research indicates that mantas may live to at least 50 years old.
Like the Oceanic manta ray, it has the largest brain weight and ratio among cold blooded fish. Also, reef manta rays have been confirmed to form social communities in specific populations.
In New Caledonia, there are records of reef manta rays diving up to 672m in search of food.It is believed that this allows Reef manta ray to act in the cold deep waters with certain Rete mirabile in the pectoral fins that can act as countercurrent heat.
The reef manta ray, as the oceanic manta ray, is ovoviviparous. After mating, the fertilized eggs develop within the female's oviduct. At first, they are enclosed in an egg case and the developing embryos feeds on the yolk. After the egg hatches, the pup remains in the oviduct and receives nourishment from a milky secretion. As it does not have a placental connection with its mother, the pup relies on buccal pumping to obtain oxygen. The brood size is usually one but occasionally two embryos develop simultaneously. The gestation period is thought to be 12–13 months. When fully developed, the pup is 1.4 m (4 ft 7 in) in disc width, weighs 9 kg (20 lb) and resembles an adult. It is expelled from the oviduct, usually near the coast, and it remains in a shallow-water environment for a few years while it grows.The disc width of the largest pup born at Okinawa Churaumi Aquarium was about 1.92 m (6 ft 4 in).
