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The ocean sunfish, Mola mola, is the heaviest known bony fish in the world. It has an average adult weight between 247 and 1,000 kg (545–2,205 lb.)! The species is native to both tropical and temperate waters around the globe, and it can frequently be seen sunbathing at the surface of the sea, which gives it its name in English. In Spanish it is called "pez luna" - moon fish, due to its round shape. It resembles a fish head with a tail, and its main body is flattened laterally. Females of the species can produce more eggs than any other known vertebrate,... up to 300,000,000 at a time!

The diet of sunfish consists mainly of jellyfish, and because jellyfish are nutritionally poor and sunfish are usually enormous, they need to consume very large amounts. They are a great natural way of keeping populations of jellyfish under control!

Sunfish can easly be seen in Mediterranean waters, especially during the warmer summer months, when they spend long periods at the sea surface. In Ireland they can be spotted in July and August. They are easy to see because their fins tend to stick out of the water. Since they are slow swimmers they tend to have many parasites on their skin; it is common to see gulls sitting on them to eat those parasites ...but sometimes they also bite the eye on that side!

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Experience Europe's marine wildlife


Sea Horse Guided Diving Tour

Spain Catalonia Costa Brava Tossa de Mar

Diving in Galicia's Atlantic Islands National Park

Spain Galicia Rias Baixas Ria de Arousa

SUP Experience in Portofino

Italy Liguria Genoa Portofino

Respectful Whale Watching in La Gomera

Spain Canary Islands La Gomera

Scuba Dive in Massmount Reef

Ireland County Donegal Fanad Peninsula

Snorkeling in Portofino

Italy Liguria Genoa Portofino

Beginner Surf Course in Sopelana

Spain Basque Country

7-Day IDEA Open Water Diver Course

Spain Galicia Rias Baixas Ria de Arousa

Sea Safari in Funchal

Portugal Madeira Islands Madeira

Nature Boat Tour of Ria Formosa

Portugal Algarve

Sunset Kayak Excursion in Sant Feliu de Guixols

Spain Catalonia Costa Brava

Cathedrals Beach Boat Tour

Spain Galicia Mariña Lucense

Alexander Shipwreck Dive in Ria de Arousa

Spain Galicia Rias Baixas Ria de Arousa

Sesimbra by Stand Up Paddle

Portugal Lisbon region Sesimbra

Exclusive Family Dive & Beach Adventure

Portugal Lisbon region Sesimbra

Boat Dive in Coelleira Island

Spain Galicia Mariña Lucense Illa Coelleira

Fishing Traditions Route in Ria de Arousa

Spain Galicia Rias Baixas Ria de Arousa

Barcelona's Port Vell

Spain Catalonia Costa Barcelona Barcelona

Discover Scuba Diving in Ria de Arousa

Spain Galicia Rias Baixas Ria de Arousa

Sea Safari & Marine Heritage Tour

Ireland County Donegal Gaeltacht and Donegal Islands The Gaeltacht and Donegal Islands