I agree with you trophywife.
There's a saying that you are what you eat... and if farmed fish are showing up to 10 times the pcb's that wild fish are (some studies show more), they are getting it in their feed.
Pretty hard to beat a nice healthy wild salmon which unfortunately it's understandable the fish farms would like to see eliminated from a profit(greed) and market share point of view.
https://www.preventivecare.com/shared/pdf/GlobalAssessmentSalmon-Hites.pdf
https://www.ewg.org/research/pcbs-farmed-salmon#.WhdbmXmQypo
https://www.health.harvard.edu/stay...-vs-avoiding-those-pcbsthe-family-healthguide
The last few paragraphs of the first link...
"The combined concentrations of PCBs, tox-
aphene, and dieldrin trigger stringent consump-
tion advice for farmed salmon purchased from
wholesalers and for store-bought farmed fillets.
This advice is much more restrictive than con-
sumption advice triggered by contaminants in
the tissues of wild salmon (Fig. 4, A and B).
The most restrictive advice (less than one-half
meal of salmon per month), which reflects the
highest health risks, was generated for farmed
salmon fillets purchased from stores in Frank-
furt, Germany, and for farmed salmon from
Scotland and the Faroe Islands. The concentra-
tions of PCBs, toxaphene, and dieldrin trigger
EPA consumption advice of no more than 1
meal per month for all samples of farmed salm-
on and for all but two samples of store-bought
salmon, for which the advice is no more than 2
meals per month.
The methods used to develop this con-
sumption advice for PCBs, toxaphene, and
dieldrin are based on estimates of potential
cancer risks and on an assumption of risk
additivity. However, this study suggests that consump-
tion of farmed salmon may result in exposure to
a variety of persistent bioaccumulative contam-
inants with the potential for an elevation in
attendant health risks. Although the risk/benefit
computation is complicated, consumption of
farmed Atlantic salmon may pose risks that
detract from the beneficial effects of fish con-
sumption. This study also demonstrates the im-
portance of labeling salmon as farmed and
identifying the country of origin. Further stud-
ies of contaminant sources, particularly in feeds
used for farmed carnivorous species such as
salmon, are needed"