Fish also contain substances called alkylglycerols that help remove mercury from their (and our) bodies. They’re quite effective against metallic mercury, but the more toxic variety created by industry and kindly dumped into the sea is a problem, so I guess you need to check where your fish has been caught (though it won’t make much difference soon enough).
If it was that risky to regularly eat fish, I think many nations in East Asia would have massive incidences of neuro-degenerative disease and other mercury-related issues. Vegetable oil is more likely to make you senile than salmon, so like with everything in this protocol, it’s about good nutrition and practising moderation. Plus, you’ll end up hating fish if you eat it everyday!