Fish equivalent of a  "tramp stamp." Because she has no clearly defined butt, she elected to place it adjacent to her pectoral fin!
You rock Edna! Radical design! 

Beauty IS in the eye of the beholder, but then again this is one buck 
ugly looking critter! Hell, I can't even tell where the legs end and the 
torso begins!  And that outfit? Pretty sure that taffeta went out in the 
60's!
Sigh!

Why yes! My eyes are on a swivel! What gave it away? 

I am NOT in 'heat.' Quit sniffing back there!