China said Tuesday that it would prohibit official banquets from serving shark fin soup, an expensive and popular delicacy blamed for a sharp decline in global shark populations.

Shark finning: one of the world's most destructive fisheries. Shark fins are removed whilst the remainder of the carcass is discarded at sea, Baja California, Mexico.

The ban, reported by Xinhua, the state-run news agency, could take as many as three years to take effect, and it remains unclear how widely it will be adhered to across a sprawling nation where orders issued by Beijing are often shrugged off by officials in faraway regions and provinces.