A growing number of octopus sightings are being reported in Guernsey.

Experts say they are returning to island waters due to the increase in sea temperature.

In the 1960s, the sea creatures were common in local waters but after a particularly cold winter, they were killed-off.

Our waters haven't suddenly got warmer in the last year, but I think because of the way they reproduce, the larvae don't disperse very far, so they've naturally recolonised but that takes a long time. Just because we haven't been seeing them for all of the last 50 years, doesn't mean that they haven't been here, but the population needs to reach a certain level before we are seeing them a lot of the time, and people are going to be reporting them, and taking photos of them.

Laura Bampton, Marine Biology secretary at La Societe Guernesiaise
Daniel Bourgaize caught the octopus whilst fishing for squid. Credit: YouTube: Inglorious Fishing

All of a sudden, got it in the net, brought it up. It was weird, I've never seen anything like that, the way it moved, it was slow, the way it brought its tentacles up is absolutely fabulous, amazing to see.

Daniel Bourgaize, Fisherman

Now, Guernsey fishermen might not be quite so surprised if they catch one of these unusual blue-blooded creatures.