Daniel Macleod, a 37-year-old fisherman from Dunbeath, Caithness, was out on his small creel boat with his nine-year-old twin sons, Max and Jake, when they sailed into a gigantic bloom of millions of jellyfish stretching approximately a mile. The encounter forced him to abandon his planned handline fishing and raised fears that the boat's engine might fail.
Unreal Sighting of Dense Jellyfish Mass
Macleod described the experience as an "unreal sitting," saying: "I've never seen anything like it ever before. I believe they were moon jellyfish. It was like a sea of jellyfish. It was just dense and thick. There was no area that there wasn't a jellyfish to be seen." The bloom was so dense that it covered the water surface completely.
Engine Concerns Amidst the Bloom
The creel boat draws in seawater to cool the engine, and Macleod feared the jellyfish could block the water intake, leaving the family stranded. "When you're going through a thick cloud of jellyfish like that, it could have blocked the water intake, which would have resulted in an issue calling for help to get us back in. So that did go through my mind when I was out there," he said. Fortunately, the engine continued running without any problems, allowing them to safely enjoy the remarkable sight.
Possible Signs of Changing Waters
The unusual encounter led Macleod to wonder whether waters are changing. "There's something definitely different out there, perhaps the water temperature?" he noted. He pointed to other unusual marine sightings in the area over the past year, including a rare fin whale and a porbeagle shark, suggesting broader environmental shifts.
Moon Jellyfish: Mostly Harmless but Stinging
According to the Marine Conservation Society, moon jellyfish are mostly harmless, though they can sting sensitive skin. Their website states: "If you see one, there are likely many more as they're very common and can bloom in large numbers when our chilly seas begin to warm up, or cool down." They can also glow in the dark. The site adds that the jellyfish form mating aggregations in late summer using the sun as a compass. Having no brain, they detect light and touch and respond to them.
An Unforgettable Experience
Despite the disruption to his fishing trip and his fears over the boat's engine, Macleod said he felt lucky to have witnessed the spectacle, describing it as an "amazing and unforgettable sight." The encounter provided a rare up-close view of a natural phenomenon that highlights the dynamic nature of marine ecosystems.
