Manta Ray Night Dives: Are They Ethical?

I’ve always loved a regular night dive. Slipping into the ocean after dark and seeing who comes out when the sun goes down feels like a secret world. Daytime fish wedge themselves into cracks to sleep, lobsters creep out, and the octopus come out to hunt. Colors look vibrent in your light beam and everything beyond it disappears.

But a manta night dive isn’t like a regular night dive.

My first manta ray night dive was in the Maldives on a liveaboard, and WOW… that was something else entirely. Unlike a regular night dive conducted much like a regular dive going around and searching for things. This you stay in one place around a "campfire" or your circle of lights. It honestly felt like an underwater concert. Or maybe like watching the Aurora Borealis, except instead of light dancing across the sky, it was these massive creatures flying in slow, acrobatic loops right above our heads. It was one of those moments underwater where you forget to check your gauges because you’re just staring in awe, trying to take it all in.

Ask anyone who has done a manta night dive and you’ll hear the same words over and over: unreal, spiritual, life-changing, the best dive of my life. The imagery is cinematic. Black water. Bright beams of light cutting upward through the dark. Then, out of nowhere, a 12-foot wingspan glides into view and begins looping through the glow like a slow-motion ballet dancer.

I won’t lie, I feel a little guilty for enjoying it so much. The curiosity and questions started to pile up after. Are manta night dives harmful? Are they becoming dependent on these sites? Is this any different from other forms of wildlife feeding tourism?

Are We Changing Their Behavior?

Yes. 

Manta night dives are built around one simple concept: Light attracts plankton. Plankton attracts manta rays.

The mantas are eating exactly what they naturally eat. The difference is that we’re concentrating that food source in a predictable location. That predictability alters feeding patterns. The mantas learn that certain sites regularly produce dense plankton blooms after dark.

The more important question is whether this behavioral shift causes long-term harm.

In places like Kona, Hawaii, where manta night dives have been monitored for decades, researchers have tracked individual mantas by their unique belly patterns over long periods of time. What they’ve found so far is encouraging. Individuals continue to feed elsewhere and move seasonally. There is no evidence of nutritional dependency tied solely to dive sites.

Is It the Same as Shark Baiting?

On the surface, it can feel similar. Humans are intentionally creating a predictable wildlife encounter. There are boats. There are lights. There are animals showing up because something is drawing them in.

But the mechanics are actually very different.

With shark baiting, food that would not naturally be there is introduced deliberately. Fish heads, carcasses, or chum are added to attract predators. Over time, that can condition sharks to associate boats or humans with a direct feeding reward. It has the potential to alter natural hunting behavior and shift how those animals interact with people.

With manta night dives, nothing new is added to the ecosystem.

The lights don’t replace their food source, they just concentrate it. Plankton naturally gathers around light. Dock lights. Boat lights. Even certain moon phases can increase plankton density in specific areas. Night dive operations are essentially amplifying that natural phenomenon in a controlled location.

In one case, you’re introducing an artificial food source. In the other, you’re aggregating a natural one.

It's a nuance that matters when we’re talking about ethics.

So… Does It Harm the Mantas?

This is the question that really matters.

Some people worry about the lights themselves. Are we damaging their eyes? Disrupting something biologically that we just haven’t measured yet?

So far, there’s no evidence suggesting retinal injury or long-term vision damage from these encounters. Mantas naturally encounter artificial light in coastal areas from docks, boats, and shoreline development. The light used in dives hasn’t been shown to physically harm them.

Others point to stress and that’s a fair concern. Not all impacts show up as obvious injuries. Stress in wildlife can be elevated energy use, behavioral shifts, long-term physiological effects that take years to understand. That said, just because we aren’t seeing obvious physical harm doesn’t mean continued monitoring isn’t important.

At the end of the day, what seems to matter most is how the dive is run.

In places like Kona, There are established best-practice guidelines that most operators follow.

• No touching
• Staying stationary (divers kneel, snorkelers hold onto boards)
• Not blocking feeding paths
• Limiting time in the water
• Coordinating between boats

Mantas have a protective mucus layer that helps prevent infection, and even brief contact can damage it. Divers are instructed to stay still on the bottom, and snorkelers hold onto a light board at the surface so you don’t chase them or block their path.

In other manta destinations, including parts of the Maldives and elsewhere in the Indo-Pacific, guidelines often exist, but enforcement can vary. Some areas have strong marine protected area regulations. Others rely more heavily on operator self-regulation which can shift with customer pressure.

So while the best practices are widely agreed upon globally (no touching, limited numbers, passive interaction) they are not uniformly enforced everywhere. 

Finding the Balance

At the end of all of this, maybe this is one of those beautiful gray areas. There is still so much we don't know about the ocean or its residents. 

I don’t regret loving that dive. It was one of the most surreal, awe-inspiring experiences I’ve ever had underwater, but I’m also glad I asked the questions afterward. 

I don’t have a perfect answer. I just know that we just have to keep asking questions and keep choosing the operators who do it right.

Somewhere between awe and awareness feels right.