There seems to be some disagreement on the topic which is why I reached out to hear any actual experience. The primary benefit mentioned in this article is related to immune system health. I'd love to see some actual research on the topic, but have not found any thus far.
I think species of fish is a big consideration here, and South American species from the Amazon are probably not good candidates. Other fish species from regions with bigger temperature fluctuations might be a different story though.