I’m obsessed with sharks: I used to kill them, now I risk my life to film them

I killed a great white when I was 18 to feed my family in Madagascar. But now I'm documenting the threat to these beautiful creatures from overfishing

The first time I came face to face with a great white shark, it was dead. I had caught it in my net. And I was so happy. I thought: I can bring a fortune back to my village. I can feed my family. I'm Malagasy - I come from Andavadoaka, a small fishing village on the south-west coast of Madagascar. It is a very dry place where no crops can grow. The name of my tribe, Vezo, means people who live off the ocean, but also people who survive it. Because we rely on it.

I became a shark fisher when I was 16 years old. I dropped out of school because my parents couldn't afford to support me any more, and followed my uncle into fishing so I could bring some money back to my family. I didn't see a shark as a magnificent creature. My mindset was: make money, kill, make money, kill. Support my family.