German researcher found Ethoxyquin in Salmon.

Read or view the original article in German:

http://www.br.de/fernsehen/bayerisches-fernsehen/sendungen/kontrovers/zuchtlachs-ethoxyquin-pflanzenschutzmittel-fischfutter-100.html

More information about Ethoxyquin in fish feed you can get here:

http://nifes.no/en/ethoxyquin-in-fish-feed