John those shrimp farms are pretty awful. I have seen them in brazil. and your right I wouldn't think of eating them. Good bait though.
But I have noticed alot of old time shrimpers who catch them just like the video you attached showed in guatemala. I wonder if they do it for export or for domestic sale. All I know is that I have seen poor people that live in plastic tarps go outside and boil up 4 lbs of big ass shrimp for their dinner. And we have eatin some monsters over there. I wonder why we can't get them here in the US. Maybe a different species of shrimp. Don't know.
And about the Antibiotics - you don't have to look much further then your good ole domestic chicken houses around the eastern shore of the US. These chickens are so chock full of antibiotics and steriods that they can barely walk if they are not slaughtered on schedule. They do it for faster growth but I never realized how horrible they are until we started eating some of the chickens we have raised here. Side by side I wouldn't ever touch that store bought chicken. Unless of course it Royal Farms Fried

but then your really not tasting the chicken.