Basking Sharks in North Devon: What They Are, When They Arrive, and How to See Them

At up to 12 metres in length and 6 tonnes in weight, the basking shark is the second largest fish in the world. Despite its size, it presents no threat to swimmers or divers, feeding exclusively on plankton filtered through its enormous gill rakers as it swims slowly at the surface. And from late May through August, these extraordinary animals visit the waters off the North Devon coast in numbers that still surprise people who encounter them for the first time.

Here is what you need to know about basking sharks and how to see them from Ilfracombe.

Why Do Basking Sharks Come to North Devon?

Basking sharks follow plankton blooms. As spring sunlight warms the surface waters of the Bristol Channel and the Atlantic approaches, phytoplankton (microscopic marine plants) bloom in enormous quantities. Zooplankton, the tiny animals that feed on phytoplankton, follow. Basking sharks, as filter feeders, follow the zooplankton.

The North Devon coast and the waters around Lundy Island are particularly productive for this food chain, and the sharks have been documented visiting this area reliably for decades. Recent years have seen sightings becoming more frequent and beginning earlier in the season, consistent with warming sea temperatures extending the plankton bloom period.

What Does a Basking Shark Encounter Look Like?

The most common sign of a nearby basking shark is the distinctive fin at the surface. Unlike the pointed, angular fin of a dolphin, the basking shark’s dorsal fin is tall, broad-based, and often accompanied by the tip of the tail breaking the surface several metres behind. Seeing the full profile of an animal this size moving slowly through the water alongside a boat is genuinely breathtaking.

Basking sharks are indifferent to boats that approach slowly and remain at a respectful distance. On our safaris, we maintain appropriate Wildlife Trust guidelines distances and never approach sharks in a way that causes them to alter course or dive. Observed correctly, the sharks will often continue feeding for extended periods at the surface.

When Are Sightings Most Likely?

Basking sharks are most reliably encountered in the Bristol Channel from late May through July, with June typically being the peak month. Flat calm days with good visibility are the best conditions for spotting fins at the surface. The two-hour and longer safari trips cover more ground and have a higher probability of encountering larger marine species than the one-hour route.

Are Basking Sharks Dangerous?

No. Basking sharks are entirely harmless to humans. They have no predatory instinct toward mammals and filter feed passively at the surface. They are, however, enormous, and their scale when encountered in the water is sobering. Our approach guidelines ensure that neither the sharks nor our passengers are put in a position that would cause either distress.

Book a Safari with the Best Chance of a Sighting

Our crew know the waters, know the seasons, and know the conditions that produce shark encounters. The two-hour Seals, Cliffs and Landmarks safari and the Lundy Island safari are the trips most likely to take you through basking shark territory.

Book at ilfracombeseasafari.co.uk or call us to discuss which trip is right for your visit.