@TenaciousGoat
It might be the drugs.
Internet says that Swai fish are from overpopulated Asian fish farms full of medicine, against parasites, and bacteria and heart decease since they don't move around and SSRI since they get depressed, perhaps it is just the overall chemical mix?
Jokes aside, I have made it a point to stay away from farmed fish for the last 20 years. I never have salmon when I eat sushi, since they are always farmed.
Internet says you should eat catfish instead. :p
@TenaciousGoat
I don't think that Asians are smarter
China has a huge population and therefore they have a lot of geniuses
But it is true that many Asians also take very good care of what they are eating during pregnancy
They even change the diet during the pregnancy to better supply the right stuff at the right time
But the modern fish farms, I don't think the effect of them are fully known yet.
They might become retards
Fish from the ocean is generally great for the brain and intelligence