杏吧原创

Seven million: that鈥檚 the estimated annual toll in the world鈥檚 largest snake harvest, currently taking place on in Cambodia 鈥� the largest freshwater lake in south-east Asia.

鈥淚 don鈥檛 know of any other reptile that is exploited to this extent,鈥� says Sharon Brooks, a graduate student at the in Norwich, UK, who described her studies of the hunt this week at the in Port Elizabeth, South Africa.

Tonl茅 Sap鈥檚 water snakes were largely undisturbed until about two decades ago, when declining fish catches and demand for meat for local crocodile farms left Tonl茅 Sap鈥檚 desperately poor fishermen with little choice but to set their nets for the snakes. Crocodile farming has surged in Cambodia since the country opened up to international trade. Local farms raise hatchlings which are then exported to Thailand and Vietnam, where they are grown for their skins.

The hunt is seasonal, reaching a peak in the monsoon from June to December. As the wet season progresses, the river draining the lake reverses its flow, causing Tonl茅 Sap鈥檚 area to expand fourfold or more. About 70 per cent of the snakes caught are rainbow water snakes (Enhydris enhydris). While the total population size is unknown, Brooks believes the current harvest is unsustainable.

Banning the hunt is impractical, given that it is so vital to the local economy. 鈥淭hese people don鈥檛 have room to manoeuvre,鈥� says Brooks. She suggests instead that suspending the hunt during the breeding season in November and December would help.