Basking sharks and bluefin tuna return to UK waters after decades of absence

Two large marine species, basking sharks and bluefin tuna, are returning to UK waters after near-disappearance driven by overfishing and food scarcity.

Bluefin tuna have been caught off the Yorkshire coast for the first time since the 1960s, when the species was fished to near-extinction in the North Sea — a return researchers are calling a conservation success story. The giant fish, which can weigh hundreds of kilograms, vanished from UK North Sea waters following decades of intensive commercial fishing that decimated their population. Separately, basking sharks — the world's second-largest fish, capable of reaching ten tonnes — have made a notable comeback to Port Erin Bay on the Isle of Man after disappearing from those shores in recent years. Observers attribute their return to recovering stocks of the plankton and small fish these filter-feeders depend on. The two recoveries together point to broader signs of ecosystem improvement in UK and North Atlantic waters. Basking sharks had been a familiar sight around the Isle of Man before their absence, making their reappearance a meaningful local benchmark for marine health. The bluefin tuna's return to Yorkshire is being formally documented by researchers monitoring North Sea recovery.

Why it matters

The return of both species signals measurable improvement in North Atlantic and UK coastal marine ecosystems after periods of severe depletion. These recoveries offer a gauge of whether conservation and fishing restrictions are producing real-world results.

What's next

Researchers will continue monitoring bluefin tuna catches and movements in the North Sea to track whether the species' presence becomes consistent.

Key facts

• Bluefin tuna have been caught off Yorkshire for the first time since the 1960s
• Bluefin tuna were fished almost to the point of extinction in the North Sea
• Basking sharks, which can weigh up to ten tonnes, have returned to Port Erin Bay on the Isle of Man
• Basking sharks had disappeared from Isle of Man shores in recent years before this return
• Researchers have labelled the bluefin tuna's return a 'success story'
• Recovering food stocks are cited as a key driver of the basking shark comeback

Bias & framing notes

Both sources are from The Guardian and take a clearly positive, celebratory framing around the recoveries, with language like 'magnificent return' and 'success story.' No dissenting scientific voices or caveats about population sustainability are included. The basking shark piece is a first-person country diary — observational rather than reported — while the bluefin piece is a news article citing researchers, making the two sources somewhat different in nature and rigor.

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