Animal rights advocacy group Ban Animal Trading (BAT) said it was alerted to the incident by a resident last week. The fish was seen at Northlands Pets.
BAT’s Prathna Singh said they informed the SPCA about the fish.
“We were told the fish were dyed using food colouring. But we did our own research and found that in fact needles could have been used and the other ways of doing it are very cruel,” she said.
Artificial colouring of fish was a process of highlighting colourful fish or dyeing fish different colours than those occurring naturally, or even covering fish with symbols, and may be done using a variety of methods, Singh said.