You are looking at a parasite called Cymothoa Spingbok – a parasite that severs the blood vessels of a fish’s tongue and becomes a new functional tongue. Only known parasite to replace an entire organ.
Free drifting in the ocean they find a host fish and enter through its gills.
The males attach themselves to the gill arches, until one is old enough to change sex to female.
Thereafter it moves onto the host fishes tongue where it bites on and stops the blood circultion, causing the hosts tongue to disintegrate.
