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A FISH that changes sex when it gets older is one of the stars of Sir David Attenborough’s stunning new series.

This is the long-awaited sequel to the award-winning 2001 BBC documentary which explores the wonders of the ocean.

And this time, using cutting edge technology, the cameras went deeper than ever before under the sea.

They unearthed some fantastic beasts and amazing sights along the way.

One of the most fascinating is a kobudai fish in Japan that actually changes sex.

When females reach a certain age and size, they start to transition and end up becoming male.

Sir David, inset, said: “Male hormones start to circulate in her body and her head expands and her chin gets longer. A ‘she’ changes into a ‘he’.” Other delights include a tuskfish cracking open a clam for dinner by smashing it against the coral; turtles enjoying “a facial” as little fish pick off parasites and dead skin; and a broad club cuttlefish pulsating its body to create a trippy light show that puts its prey into a trance. Filming took place across the globe. Sir David hopes the show will bring about two things – that mankind does something to stop the rising sea temperatures and a worldwide ban on dumping plastic in the oceans. He said: “We have seen tragedies happen because of it. We’ve seen albatrosses come back with their belly full of food for their young and what comes out? “Not squid, but plastic. And the chick is going to starve and die.” ¬

The amazing show launches on Sunday on BBC One.