Photojournalist Nicole Tung on the environmental and human toll of overfishing

Seventy percent of fish stocks in Southeast Asia have been depleted in just 40 years, and both the environmental and the human cost is getting worse. That's the conclusion of a new photojournalism report which focuses on the fishing industry in the region. Its author says her photographs show  the number of fish being taken out of the ocean is simply not sustainable. Her work also shows the appalling conditions for many of the fishermen themselves, who are treated little better than slaves – with some not even allowed onto dry land for up to two years. Nicole Tung is this year's winner of the Carmignac Photojournalism Award. She spoke to us in Perspective.