Ringing Ceders

I have been reading a lot of stories in the news about how a lot of fish these days have high levels of heavy metals like mercury and lead that are bad for you. It makes me worry about eating fish, although I have found a website that lists the fish that are least likely to have high levels of heavy metals. I am thinking about taking Omega 3 fish oil supplements, and I want to find a brand that tests its fish oil to make sure it doesn’t have high levels of heavy metals. Can anyone tell me which brands do this?