4. Salmon is technically a white fish
It gets that orange color from a diet of crustaceans.
5. Live scallops aren't actually alive
That's just the natural resiliency of the fibers in the scallop that cause it to contract and expand, making it look like it's moving.
6. Uni isn't exactly what you think
You probably know that uni is sea urchin, but you may not realize the delicacy is, specifically, that creature's genitals. And now that you know, perhaps you wish you could forget.
7. Bluefin wasn't always so desirable
Nowadays bluefin tuna is one of the most expensive sushi delicacies. Case in point, in 2013, a 500lb fish sold for a record-setting $1.8 million in Tokyo's Tsukiji fish market. But fishermen once avoided the bluefin because it was such a strong swimmer that it could easily tear through a fishing net. That changed in the '50s when stronger nylon netting made catching them much more practical. Unfortunately, this has led to dangerous overfishing.