Not sure how well it will come through on video, but I guess by leaving a chopped-up fish alive enough to let its heart still beat indicates the freshness of the fish.
Hmm. It seems Twitter is one of the banned sites this side of the Great Wall, so no direct tweets from me (who said thank god?). Luckily my posterous blog cross posts to Twitter in the US!
... or something like that. Seemed to be popular with the Japanese tourists. I'm not sure if they eat them bones-and-all.