Now THAT'S an expensive meal! Anyhow, I do not think that aquarists would rush over to the local fish market to buy all the loaches as they wouldn't be very healthy. Here in Toronto for instance, there are several Asian markets, and the one closest to my house has live lobster, live crayfish, live oysters, live carp, live catfish, live striped bass, live green (largemouth?) bass, live tilapia, and live eels. I have fortunately only bought live crayfish/lobsters from there, as most are alive. The fish are also fresh, and lively enough to be selling in tanks. That said, I bet if I bought some bass/tilapia and properly accumulated them to a pristine tank, they probably would not live 3 days because they are not in good health. I suspect if Asian markets were selling live clown loaches, they'd have skinny disease or parasites - fine to eat but not as pets.