The Story of a Fish That Enters the Urinary Tract and Cannot Escape

Thursday, January 01, 2026

SAEDNEWS: Candiru: The Fish That Is Attracted to Urea and Can Enter Human Urinary Tracts

The Story of a Fish That Enters the Urinary Tract and Cannot Escape

According to Saed News, this Amazon-native fish has a strong attraction to urea. If someone urinates in the river, the fish can follow the stream of urine—reaching the bladder in women and the urethra in men. There is no way for it to exit easily; if it reaches the bladder, it may stay there, and if it gets stuck in the urethra, its backward-facing scales prevent it from coming out.