Scientists fear that high sea temperatures could have wide-ranging consequences for marine life.

A marine heatwave could reach “extreme” levels around parts of the UK later this week, according to the Met Office, raising concerns for marine life.

Long periods of sea heat can trigger mass die-offs among some seagrasses, shellfish and other species, as well as encouraging greater numbers of warm-water creatures including octopus.

The heatwave is currently strongest off the coasts of eastern and southern England, and sea temperatures could reach 4-5C above average in places.