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New research suggests the global decline in wildlife is connected to an increase in human trafficking and child slavery. Ecologists say the shortage of wild animals means that in many countries more labour is now needed to find food. Children are often used to fill this need for cheap workers, especially in the fishing industry. The decline in species is also helping the proliferation of terrorism and the destabilisation of regions. According to a study in the journal, Science, the harvesting of wild animals from the sea and the land is worth $400bn annually and supports the livelihoods of 15% of the world�s population. But the authors argue that the rapid depletion of species has increased the need for slave labour. Declining fisheries around the world mean boats often have to travel further in harsher conditions to find their catch. In Asia, men from Burma, Cambodia and Thailand are increasingly sold to fishing boats where they remain at sea for many years, without pay and forced to work 18-20 hour days. �There�s a direct link between the scarcity of wildlife, the labour demands of harvests and this dramatic increase in child slavery,� said Prof Justin Brashares from the University of California, Berkeley, who led the study. �Many communities that rely on these wildlife resources don�t have the economic capacity to hire more labourers, so instead they look for cheap labour, and in many areas this has led to the outright purchasing of children as slaves.� This exploitation also happens in Africa, where people who once found their food in the neighbouring forests now travel for days to find prey. Fishers to pirates Children are often used by hunters to extract wildlife from areas that would be too costly to harvest. The researchers contrast the outcomes of the collapse of fisheries of the north east coast of the US and in the waters off Somalia.