The Centre for Food Safety (CFS) of the Food and Environmental Hygiene Department in Hong Kong has found traces of malachite green in two tinned fried dace samples.
The affected products include Yupin fried dace with salted blackbeans and Pearl River Bridge fried dace with salted black beans with best-before dates of 2 January 2017 and 21 May 2018, respectively.
Both the products are from China and were sold at Wellcome Supermarkets at North Point and Sai Wan.
Hong Kong does not allow foods containing malachite green, which is a type of industrial dye and has been used for treating infection in fish.
CFS spokesman said: "The CFS collected six samples of fresh dace and three tinned fried dace samples from different local retail outlets for analysis.
"Results showed that malachite green was found in two samples of tinned fried dace of different brands respectively taken from Wellcome Supermarkets at North Point and Sai Wan at levels of 1.3 and 0.78 parts per billion respectively."
The supermarket chain concerned has stopped sale of the two affected batches of the products after being instructed by the CFS.