It was thanks to seeing this episode in Ala Carte that I learned that Japanese raw salmon menus (such as sushi and sashimi) used Norwegian salmon, and that this manga chapter predates those salmon imports becoming widespread and the practice of eating raw salmon becomes commonplace in Japan. I was so confused at first when Kaibara had a fit about the raw salmon and all that blah about doctors and scientists being involved, because I've been seeing salmon sashimi in Japanese stores in Japan.