Basking Shark Sightings Surge Around the Isle of Man

From 2009 to 2022, recorded basking-shark sightings around the Isle of Man fell dramatically, dropping from 885 observations to a single individual. Researchers and local observers attributed the decline to several factors: reduced prey availability, warming sea temperatures, and the hypothesized repellent effect of electromagnetic fields from underwater electricity cables. The theory that cable-generated fields deterred migrating sharks gained particular attention, though it remained unproven.

The Guardian

During the current summer, more than 100 basking-shark sightings have been reported, marking a stark reversal of the previous decade’s trend. The southwest corner of the island, especially near Bradda Head and the entrance to Port Erin Bay, has emerged as a hotspot. Observers note a “good bloom” of microscopic crustaceans known as copepods—the primary food source for basking sharks—along the coastal waters. These copepods are believed to support the recent increase in shark presence.

The Guardian

Experts from the Isle of Man’s fisheries department have linked the surge in sightings to the abundant copepod population, suggesting that plentiful prey is driving the sharks’ return. Local spotters, including recreational boaters and shoreline observers, have expressed enthusiasm for the renewed visibility of the species, describing the large dorsal fins glinting in sunlight as “magnificent.” The resurgence offers both ecological interest and a boost to marine-tourism activities on the island.

The Guardian

Basking sharks are the world’s second-largest fish and play a role in marine ecosystems by feeding on planktonic organisms. Their return may indicate improving oceanic conditions in the region and provides a tangible sign of ecological recovery after years of decline. Continued monitoring will be essential to determine whether the current bloom represents a temporary fluctuation or a longer-term rebound.

The Guardian