What's in this clown fish mouth?

Hello steemians,how are you all after so many days i am back.today i would like to tell about a interesting fact.
You can see an image that i posted below and i found that image in instagram.i know u will get finding nemo in your mind when u see this clown fish and me too.but what is in it's mouth?a white thing which is sitting in it's mouth.is that a good thing or bad one?

Absolutely it is a bad one for the fish.because it is somewhat unpleasant to it. tongue eating louse which is a parasite &also called Cymothoa exigua. It causes somewhat unpleasant to fish.It enters through gills into fish mouth and severs blood supply of the tongue then causing it to fall off and this parasite attaches to remaining stub of the tongue and becomes fish's new tongue.but it never harms or kills the fish.

Hope you learned something and get to know a new thing by my post thanks for reading.....
Yours @summisimeon