On and off-screen, Aquaman's Jason Momoa fights for the world's oceans

Without a healthy ocean life, our planet as we know would not exist,"

Momoa said with the sea behind him as he took part in an event on a Portuguese beach

ahead of the United Nations Ocean Conference in Lisbon, which starts on Monday.

In the superhero blockbuster, Aquaman, popular Hollywood actor Jason Momoa

plays the role of protector of the deep, but with the world's oceans under threat in

real life, he is also taking the fight off-screen. "Without a healthy ocean life, our

planet as we know would not exist," Momoa said with the sea behind him as he took

part in an event on a Portuguese beach ahead of the United Nations Ocean Conference in Lisbon, which starts on Monday.

Paramount's all-American blockbuster "Top Gun: Maverick" is still flying high at the box office