I am always amazed at the variety and reasonable cost of fish and shellfish at our local Ranch 99 market (a pan-Asian market and big seller of Chinese products). It seems the only place in my town where I can find the smaller Manila clams that I prefer to Littlenecks for making Linguine alle Vongole. Likewise with the cooked and shelled crawfish tails- absurdly cheap when you consider the time saved by not doing that work yourself. Blue crabs and other arthropods, shrimp paste and nice-smelling fresh fish...really makes a person want to cook dishes that you usually save for restaurants. But then, I don't look at the state of Chinese aquaculture with rose-colored glasses- toxic slag-ponds converted into tilapia farms, crawfish raised in PCB and lead-polluted estuaries...I could go on and haven't yet mentioned the questionable sources of the protein meal used to feed a lot of these species. I'm not even taking a look at this from the standpoint of conservation- that would have me eat locally and perhaps more safely, but it's hard to resist beautiful-looking tiger prawns at bargain basement prices over at the Asian market. I'm pretty certain that very little or even negligent oversight goes into the production of these delicacies- is this stuff safe to eat, even in small amounts?