Do manta rays have teeth?

Manta rays possess tiny, vestigial teeth lined only on their lower jaw, but they do not use these teeth to chew food or bite prey.

Rather than relying on sharp jaws to tear prey, these animals feed through a highly specialized filtration system. According to the Marine Megafauna Foundation, manta rays have rows of tiny vestigial teeth on the lower jaw only, and they do not use them for feeding. Peer-reviewed elasmobranch literature indicates that the exact function of these lower-jaw teeth remains unresolved, though researchers associate them with securing a mating grip during reproduction rather than capturing food. Because mantas strain their food instead of biting, NOAA Fisheries notes that there is no bite risk to snorkelers in the water. Feeding takes place through specialized gill plates that strain zooplankton directly from seawater.

Hawaiian Reef Manta Characteristics

The resident Hawaiian reef manta ray (Mobula alfredi) can reach wingspans up to ~16 feet, with typical adult spans ranging between 8 and 16 feet. Beyond their size, these elasmobranchs feature cephalic fins—paddle-like structures on their head—that unfurl to funnel plankton into their mouth while feeding and roll up tightly when cruising. Research demonstrates their cognitive abilities, noting that manta rays have the largest brain-to-body ratio of any fish and can pass the mirror test. Local researchers catalog the resident population individually using unique belly spot patterns.

Global Context and Hawaiian Waters

Globally, reef mantas (Mobula alfredi) are obligate filter feeders dependent on rich plankton populations. While mantas travel across ocean corridors worldwide, the Big Island's Kona coast provides the only reliable year-round manta night snorkel in Hawaii. Snorkelers near lit platforms off the Big Island can observe these plankton filter feeders gathering close to the surface.

Dynamic Feeding Behavior off the Kona Coast

The gathering of mantas along Hawaii's Big Island is powered by the island mass effect. Steep underwater slopes of the volcanic island force deep, nutrient-dense ocean currents upward. This continuous upwelling creates a year-round plankton supply that supports a resident, non-migratory population. During a night snorkel arranged through local /tours or visiting locations like /snorkel/manta-village, powerful submerged lights act as a "dinner bell" by concentrating plankton. Unlike passive cleaning stations in the Maldives or the Great Barrier Reef where mantas pause to be groomed, Kona's sites serve as active feeding stations where mantas execute visually dynamic barrel rolls to scoop up food.