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Mola mola: the sunfish of Nusa Penida
The ocean sunfish (Mola mola) looks wrong. It is, essentially, a giant fish head with fins. Adults can weigh over 2,000 kg, making it the heaviest bony fish in the world (sharks are cartilaginous, so they don't count).
They spend most of their time at depth, coming up to shallower water only at specific times and places — often to visit cleaning stations, where reef fish pick off the parasites they accumulate in the cold dark.
Where to see them
The most reliable site in the world is Crystal Bay and Blue Corner on Nusa Penida, Bali, during the July–October season. Cold upwellings bring the sunfish up from depth to cleaning stations at 15–30 meters. Every dive shop in Bali runs trips.
Other sunfish sites:
- Galápagos Islands (Pacific species Mola tecta)
- Monterey Bay, California (seasonal)
- Azores (summer)
What to expect
Cold water (sometimes 18°C when the upwelling hits — bring a thick suit). Strong current. And then, if you're lucky, a 2-meter-wide lump of alien biology drifts past at 25 meters, stops, and lets you take photos. They don't react to bubbles. They don't startle. They just... exist.