. >> roshl, what do you have break? >> i don't know about you three but i love oysters. but it seems like they might be in a bit of trouble. there is a bit of mystery around why. but scientists are on the case and we are going to look at it when we come back. t line iraq only on al jazeera america >>> guys, welcome back to "techknow." i am phil torres. rochelle, what can you tell me about oysters? >> they are in trouble but they are sort of the canary in the coal mine. i went up to the coast to figure out how science is working to figure out what's going on. why don't we take a swim? >> it's not every day you can tag along with the california oyster farmer. >> that little island out there? >> it's so small. >> i know. >> when you do, it's truly exhilarating. >> this floating in the water we called sand waves, one of the ways we grow our baby oysters. >> the 15 mile long bay is peppered with some of the largest oyster farms including the world famous hog island oyster company. >> these are those racks that they are pulling now. each one of those will have 800 oysters in i