Warming seas linked to bluefin tuna surge in UK waters
Growing numbers of bluefin tuna are being seen in the waters around the UK because of the warming impact of a long term ocean current say researchers.
Scientists say that their recent rise is connected to the Atlantic Multidecadal Oscillation (AMO).
Now in a warm phase, the current makes UK waters more hospitable for the fish.
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Bluefin tuna are one of the largest and fastest fish on the planet - they can weigh up to 900kg and can travel at speeds of up to 70 kilometres per hour (43mph).
In the 1930s, the species was a common sight in the seas off Scarborough and was highly prized by big-game fishers.
However, from the 1940s, the species began to decline and by the early 1990s had all but disappeared.
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