Lol, I think the fish they used (no longer legal practice in America because of salmonella, strep a and staph infections) were baby candiru... One of my favorite all time river monsters is that candiru catfishes bigger cousin the asu!! They worm their way into whatever orifice they can and eat their food from the inside out, leaving the carcass by the hundreds pushing their way through the thin skin, leaving barely visible exit wounds, no internal organs, nothing but the skin and bones left!! The smaller candiru are known for their occasional trip up a human males urethra- it's an accident on their part.... Sorry GodFan, don't mean to creep you out even more... If it's any food for thought, my oscar just ripped the cuticle and skin around it off of my finger while I was hand feeding him and not paying enough attention, he hates when I type or talk on the phone while feeding him and he will bite hard. If I'm paying attention to him he simply nudges my finger with top lip a couple times...