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Manta ray

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Manta rays are large, highly intelligent fish belonging to the genus Mobula. They are members of the order Myliobatiformes, a group that includes stingrays and their relatives. These animals are part of the Myliobatidae family, which are known as eagle rays. Mantas are unique among rays because they have evolved into filter feeders. They possess a very high brain-to-body mass ratio, the largest of any fish.

Giant oceanic manta ray
Giant oceanic manta ray

This intelligence is evidenced by their ability to pass the mirror test, suggesting a level of self-awareness. They inhabit warm temperate, subtropical, and tropical waters across the globe.

To feed, mantas use a specialized mechanism called filter feeding. They swim through the water with large, rectangular mouths facing forward. As they move, they use horn-shaped cephalic fins to channel water and food into their mouths. Inside their gill arches, they have pinkish-brown gill rakers. These rakers are made of spongy tissue that acts like a sieve to collect zooplankton.

Manta birostris feeding
Manta birostris feeding

While they eat shrimp and krill at the surface, research shows most of their diet comes from mesopelagic sources in deeper water. To breathe, they must keep swimming with their mouths open to pass oxygenated water over their gills.

There are three recognized species of manta rays. The largest is Manta birostris, which can reach widths of at least 7 meters. This species is highly migratory and travels across open oceans. The smallest is Manta alfredi, the reef manta ray, which reaches about 3.7 meters in width. M. alfredi tends to be a resident, coastal species found in the Indo-Pacific and tropical East Atlantic.

Manta alfredi cruising - journal.pone.0046170.g002A
Manta alfredi cruising - journal.pone.0046170.g002A

A third species, Mobula yarae, was formally described in 2025. It is known as the Atlantic manta ray and inhabits the tropical West Atlantic, including the Caribbean.

The history of manta naming has been quite complex. In 1829, Dr. Edward Nathaniel Bancroft published work on the "sea-devil" in Jamaica. Over many years, researchers used various names like Ceratoptera and Diabolicthys. Most of these were eventually determined to be synonyms for Manta birostris. The name "manta" itself comes from Portuguese and Spanish words for a mantle or cloak. This refers to the shape of a traditional blanket-shaped fishing trap.

MantarayMocheLMC
MantarayMocheLMC

Some people call them "devilfish" because their cephalic fins look like horns.

Mantas exhibit fascinating social and survival behaviors. They often visit cleaning stations on coral reefs. At these locations, smaller fish remove parasites from the manta's skin.

Manta alfredi at a ‘cleaning station’ - journal.pone.0046170.g002B
Manta alfredi at a ‘cleaning station’ - journal.pone.0046170.g002B

Mantas may even show philopatry, which means they return to the same cleaning station repeatedly. They also engage in group feeding behaviors. They can form a "cyclone," a massive spiral of up to 150 mantas. These feeding circles can reach 10 meters in diameter and last for an hour.

Manta alfredi maldives
Manta alfredi maldives

Some mantas even leap out of the water, a behavior called breaching, though the reason remains unknown.

Despite their size, mantas face significant biological and environmental challenges. They have a very slow reproductive rate, as gestation lasts over a year before they give birth to live pups. This makes them highly vulnerable to human threats. They face pollution, entanglement in fishing nets, and direct harvesting. Specifically, their gill rakers are highly valued and traded internationally for use in Chinese medicine.

Elinkine3
Elinkine3

Because of these pressures, M. birostris and M. alfredi are both listed as vulnerable by the International Union for Conservation of Nature.

Manta rays are deeply connected to the health of marine ecosystems. They serve as important components of the pelagic food web. Their presence is often a draw for tourism, as many people enjoy watching them in the wild. However, they are more vulnerable to threats when they are close to the shore. While they are protected in international waters by the Convention on Migratory Species of Wild Animals, local protection remains a critical concern for their survival.

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🖼️ Images & Media (10)
File:Manta birostris-Thailand4.jpg
Manta birostris-Thailand4.jpg
File:Manta alfredi cruising - journal.pone.0046170.g002A.jpg
Manta alfredi cruising -...
File:Manta alfredi at a ‘cleaning station’ - journal.pone.0046170.g002B.jpg
Manta alfredi at a ‘cleaning station’ -...
File:Manta birostris feeding.jpg
Manta birostris feeding.jpg
File:Manta alfredi maldives.jpg
Manta alfredi maldives.jpg
File:Elinkine3.JPG
Elinkine3.JPG
File:Manta birostris-Thailand3.jpg
Manta birostris-Thailand3.jpg
File:MantarayMocheLMC.jpg
MantarayMocheLMC.jpg
File:Mobula.jpg
Mobula.jpg
File:Giant oceanic manta ray.jpg
Giant oceanic manta ray.jpg
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