This is a pattern for the fin only.
Here is the link I used for the body of the Mermaid Lapghan: https://www.madhooker.com/mermaid-lapghan/

For the sample I made, I used 2 strands of Red Heart Shimmer in Plum held together throughout the pattern. I used not quite 2 balls. If you notice the ball of yarn in the fin photo above, that is all I had left. It was cutting it close! Please make sure you have enough of your yarn choice on hand.

Gauge 8 rows=4” 12 dc=4” (Gauge is not important)

Hook Size H 5.00mm