The UK’s seas have had their warmest start to the year since records began, helping to drive some dramatic changes in marine life and for its fishing communities.

The average surface temperature of UK waters in the seven months to the end of July was more than 0.2C higher than any year since 1980, BBC analysis of provisional Met Office data suggests.

Scientists and amateur naturalists have observed a remarkable range of species not usually widespread in UK waters, including octopus, bluefin tuna and mauve stinger jellyfish.

The abundance of these creatures can be affected by natural cycles and fishing practices, but many researchers point to the warming seas as a crucial part of their rise.

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