Sew the pectoral fins on either side of the sharks body around rows 13 from the mouth.
The tail should have the big part facing upward when doing this.
Sew the dorsal fin in the centre of the shark top around 2 rows back from the pectoral fins.

Embroider gills
Cut a piece of black yarn about 20 cm/8 inches.
Just before the front edge of the pectoral fin, embroider 3 vertical lines decreasing by 2 stitches in length toward the mouth that are about a stitch apart from each other.
Entering from bottom of the shark and out point A, enter B (approximately 7 stitches apart) and exit C, (two rows toward the mouth and 1 stitch lower than A) then enter D (approximately five stitches apart) and exit E (two rows toward the mouth, and one stitch down from B) and finally enter F (approximately 3 stitches apart) and out from the bottom of the shark. Fasten off and weave in ends.

Embroider mouth
Cut a piece of black yarn about 20 cm/ 8 inches.
Embroider the mouth as such:
Insert your needle under the head, and bring it up where your mouth starts. Draw the yarn through, leaving a short yarn tail.
Insert your needle about 8 stitch to the left and pulling your needle to another point through the center of the mouth.
Insert your needle in the same spot but around the black thread.
Pull your needle through the right side of the mouth about 1 stitches up diagonally.
Put your needle downward about 2 stitch and go through the other side of the mouth about 1 stitch down diagonally. Go up about 2 stitch.
Use your needle to go through the same spot to the starting point under the head.
Bruce the crochet shark is ready!