it isn't just about THE FISH you eat but it also where it came from
not to be one of those 'disagree' people but salmon is technically one of the WORST ship to eat. why? because it is all farmed.. you want wild salmon? you need to go catch it yourself. they don't sell wild caught salmon in stores, even though they claim it to be wild.. they even add color and additives to the fish. those additives can actually kill a cat, and they are toxic to use in moderate amounts
so you want the healthiest fish? go fishing yourself