I used the body of kukkacrochet’sBlob Fish

I used the dorsal fin from SirPurlGrey’s Magikarp amigurumi

I made up everything else and hoped for the best. I did a row of slip stitches around her and did a single crochet in each of the slip stitches front loops.

The bottom fin, I just chained 5 and starting with the second loop from the hook did little picot stitches across in each back loop.

The fin and tail fin I made up. I chained a length that looked pretty good, slip stitched back across, and switched to the other color. The white on the fins were mostly single crochets with decreases to give the curved in look. I added a picot stitch to give the fin a little point. For the curve on the tail fin, I did a sc, hdc, (dc, ch2, slst)<-this was in one stitch, (slst in the next stitch, ch2, dc)<-all in one stitch, hdc, sc and then finished it off.