dalai farmer, you missed the rather more important parts of that quote
"A well-circulated myth is that the candiru is capable of swimming up the stream of urine in mid-air to a victim standing on shore or a boat. This is physically impossible as the maximum swimming velocity of the fish is insufficient to oppose the downward velocity of the urine stream, and the further impossible act of the 5–14 mm wide fish maintaining position and thrust within a 2-7 mm wide column of fluid"
( Vipros. clever got me this far, then tricky got me in, Tue 26 Aug 2008, 10:11, Reply)