Ceasg
Region of origin: Scotland
A fresh-water mermaid with the back half of a salmon grilse, wild ceasg may be a danger to fishermen but if one catches her, she must grant them three wishes. Some have been said to settle down and have families with humans.
Originally posted on Tumblr on October 7, 2015
The Compendium of Arcane Beasts and Critters 