"They take the fins back to land and make soup out of them."
Hector researched the subject and wrote the script himself. He found that 100,000,000 sharks are killed each year for their fins - that's not a typo, it really is 100 million - while sharks kill an estimated 10 humans a year.
"We are the monsters," he said.
Hector's mum, Jo Danilo, decided the speech was such a success it needed to be filmed. So, with brother Felix, 11, as cameraman/producer, the young environmentalist made a video and shared it on Greenpeace's Facebook page. The organisation is now using it in Shark Week, which runs until Sunday.
Dad Jan said: "Greenpeace asked if they could use it, and we thought that was awesome as."
Hector hoped the video would help end shark finning, which is still legal in New Zealand waters.
The brothers are planning a video on the plight of some of the world's most endangered marine mammals, New Zealand's Maui and Hector's dolphins.
* To see the video, go to The Northern Advocate Facebook page and scroll down until you find Hector on Shark Finning.