Ethoxyquin is a fire retardant used in dried animal and fish food. It’s carcinogenic. Australia the US and Asia allows its consumption. The EU and UK have banned it Here, higher levels have been found in Tasmanian salmon than in pre-ban tested fish in the EU The Greens want it banned #auspol
While we might know what food we eat, we don’t always know what the food we eat is fed. In the case of farmed fish, it might be carcinogenic fire retardants.