The ocean sunfish, or mola mola, is the heaviest bony fish in the world, a flattened, almost tailless disc that can weigh over a tonne. It looks like a fish that stopped growing halfway, and meeting one underwater is genuinely otherworldly. Molas prefer cooler water and visit cleaning stations at a few famous sites. This guide covers where and when to find them, and why the warm Caribbean is not their home.
The strangest fish in the sea
The mola mola has a tall, rounded body with long dorsal and anal fins and no real tail, so it sculls slowly through the water. It feeds largely on jellyfish and often basks at the surface to warm up after deep dives.
Despite its size it is harmless and slow, and it will tolerate calm divers who approach gently and give it space.
The best places to see them
- Bali (Nusa Penida and Nusa Lembongan), Indonesia: the classic mola season.
- Galápagos, Ecuador: cool upwellings bring them in.
- Portugal and the Azores: Atlantic sightings in warmer months.
- San Diego, California: sunfish at the surface offshore.
- Bass Strait and southern Australia: cool-water encounters.
When to go
Bali's famous mola season runs roughly July to October, when colder water rises around Nusa Penida. This is also the trade-off: that water can be chilly and the currents strong, so a thicker wetsuit and good buoyancy control help. Elsewhere, target the season when local upwelling brings cool water toward the coast.
Approach slowly, never crowd a mola at a cleaning station, and let it decide how close to come.
Why you will not find one in the Caribbean
Mola mola favor cooler, temperate and upwelling waters, so the warm, steady Caribbean is not typical sunfish habitat. Sightings in this region are extremely rare and accidental. If a giant sunfish is on your list, plan a trip to Bali or a cool-water destination.
The warm reefs of Colombia have a completely different, and equally rich, cast of characters to offer.
Warm-water wonders at Isla Fuerte
The mola is a creature of the cold, but the reefs of Isla Fuerte celebrate the opposite: warm 27 to 29 degree water, easy comfortable diving and a parade of turtles, eagle rays and reef fish. It is a different kind of wonder, on some of the best-preserved reefs of the continental Caribbean.
Come explore it with Nautilus, a PADI center with 29 dive sites. Read more guides or plan your stay through our lodging.
