Police are warning people to beware of doorstep salesmen trying to make a trade out of selling fish.
They often use unmarked, unrefrigerated vehicles and are thought to be from the Durham or Middlesbrough area.
The fish being sold is nicely packaged and correctly labelled, but overpriced and of dubious quality.
Police are linking the fish sellers distraction and rogue trader-type incidents.
Anyone with information should call 101.