Warming seas have increased the number of octopuses off the waters of the UK, decimating shellfish numbers and leaving fishermen floundering

When veteran fisherman Brian Tapper checked his 1,200 crab pots in waters off southwest England during this year’s crabbing season, he got a series of unwelcome surprises.

At first, in March and April, they were almost empty. Then, starting in May, they were unexpectedly packed with octopuses before sitting largely empty again over the last month or so.

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