In the past I liked how easy it is when one company offer products to basically everything (i.e. Google), but now that I see the consequences, I’m somewhat disturbed.

It would be the best to try out many different breeds of fish to figure it out. Smoked mackerel and smoked salmon have very distinct taste and can be either a very good start or the opposite. Besides that maybe trout? Also depends what kind of fish they sell at your local stores.