The secretive traders fulfilling demand for a Chinese delicacy | Geoffrey Kamadi

Highly prized for its swim bladder - served in soups and stews - the fish could disappear altogether from Africa's Lake Victoria thanks to the lucrative trade

A thriving trade in fish maw - made from the swim bladders of fish - could lead to the extinction of the Nile perch fish in east Africa's Lake Victoria.

Demand for fish maw has spawned such a lucrative business enterprise in the region that it is raising concerns of overfishing.