Fish meal is often processed with ethoxyquin used as a preservative.

From the article linked below –

"Ethoxyquin is an anti-oxidant used as a food preservative and a pesticide (called ‘Stop-Scald’). It is listed and identified as a hazardous chemical by OHSA. It has a rating of 3 on a scale of 1 to 6; with 6 indicating super-toxicity and requiring less than 7 drops to cause death. The containers that Ethoxyquin is stored and shipped in are marked with the word/symbol ‘POISON’. The US Department of Agriculture lists and controls Ethoxyquin as a pesticide."

"The FDA has mandated that Ethoxyquin is no longer legal for use in human food – with the exception of some spices. The use of Ethoxyquin remains legal for use in animal grade food."

http://ottawavalleydogwhisperer.blog...danger-do.html

There are quite a few other articles linked in the above site. Just something to keep in mind...