yeah that why my Vietnamese friend here doesn't understand why I Paroon Sharks. I said they look cool. When I ask him why he don't like them he simply says. In Vietnam those fish EAT SH*T
My aunt is Vietnamese...she tells me the same thing.
Apparently when she was a child, she had a pond full of Pangasius catfish in her school...the school toilets were located over the pond...you get the idea....