Authorities in South Korea's capital are trying to untangle themselves from a slimy row: how many octopus heads is it safe to eat?

Octopus heads are a favourite dish on the peninsula - for their apparent aphrodisiac qualities.

In September, the Seoul city government enraged restaurateurs and the fishing industry when it announced octopus heads contained hazardous amounts of cadmium, a carcinogen that poisons the liver and kidneys.

It advised against eating more than two heads a day.

Enraged fishermen threatened to sue the government, and their cause caught the imagination of the public when politicians representing their constituents took an octopus into a national assembly session, causing laughter as it tried to escape the jar.

Lee Wan-beom, a fisherman from the county of Muan, told the Korea JoongAng daily that prices for octopus had halved since the government's warning.

- Reuters