Banana fibers get colored brown by bile, and then you think you have cotton balls with legs.
//www.curezone.org/ig/i.asp?i=49712
The photo is showing undigested banana pieces!
Flukes looks like this:
//www.curezone.org/ig/i.asp?i=173
Undigested bananas and undigested foods have irregular shape, while flukes and other worms have very regular shape and can easily be identified and recognized inside feces.
Most of the objects on the next pictures show undigested food, definitively not worms or flukes:
//www.curezone.org/ig/f.asp?f=1742
//www.curezone.org/ig/f.asp?f=2097
//www.curezone.org/ig/f.asp?f=1999
See the videos
A flat, leaf-shaped, brown worm (fasciola hepatica) emerging from the common bile duct
White Shark