Quick correction to the note at the end.
2.5 meters is NOT 12 feet. It's a little over 8 feet. At first, I thought the idea of a 24 foot sturgeon was a typo, but a bit of research shows that there was a sturgeon caught over 23 feet and almost 3500 pounds.
https://en.wikipedia.org/wiki/Beluga_(sturgeon)#Size
It should probably be 3.5 meters. I thought the typo was one thing and the size was exaggerated, but it was actually the other thing and the research was legit.
You know, I really appreciate these little notes at the end of each chapter. It really helps show just how much research goes into this very weird manga, and it's a shame that the official releases don't do something similar. I think I'm going to go back and save every glossary note because it would be a shame to lose them.