Primary school teacher Mavis Chua, 59, was excited about being able to buy salmon any time.

She told The New Paper: "It's convenient for those working full time, because we won't have to rush to the market in the morning just to get fish."

The machines offer ease and convenience by operating cashless 24/7. There are currently nine of them in areas such as Ang Mo Kio, Woodlands and Bukit Batok, all of them certified by the National Environment Agency.

The vending machines operate at -20 deg C and sell 200g of vacuum-packed frozen salmon at $5.90.

According to tnp.sg