The world's thousandth sustainable fish product carrying the Marine Stewardship Council logo has gone on sale in Japan.

Greeneye hot pollock roe (aka karashimentaiko) from MSC-certified Alaskan pollock went into Aeon stores across the country. It marks a period of rapid expansion for MSC lines, which are now sold in 35 countries.

"It took seven years to get from the first product in 1999 to 500. Now - just nine months later - retailers have doubled that number," said Rupert Howes, chief executive of the MSC. "No one predicted this rapid growth in demand for certified sustainable seafood."