Pattern

With blue yarn :

Tail :

Round 1 : Make a magic ring and work 4 dc in the ring (don’t forget to add 2ch after the initial sl st), join with sl st in first dc — (4 sts)
Round 2 : Ch 3, 2 dc in next st, dc in next 3 sts, join with sl st in first dc — (5 sts)
Round 3 : Ch 3, 2 dc in next st, dc in next 4 sts, join with sl st in first dc — (6 sts)
Round 4 : Ch 3, 2 dc in next st, dc in next 5 sts, join with sl st in first dc — (7 sts)
Leave enough yarn to sew this half to the other one.
Make another one.
Sew the 2 halves together like this :

Pectoral fins :

Round 1 : Make a magic ring and work 5 dc in the ring, join with sl st in first dc — (5 sts)
Round 2 : Ch 3, 2 dc in next st, dc in next 4 sts, join with sl st in first dc — (6 sts)
Round 3 : Ch 3, 2 dc in next st, dc in next 5 sts, join with sl st in first dc — (7 sts)
Round 4 : Ch 3, 2 dc in next st, dc in next 6 sts, join with sl st in first dc — (8 sts)
Leave enough yarn to sew the fin to the body.
Make another fin.

Dorsal fin:

Round 1 : Make a magic ring and work 5 dc in the ring, join with sl st in first dc — (5 sts)
Round 2 : Ch 3, 2 dc in next st, dc in next 4 sts, join with sl st in first dc — (6 sts)
Round 3 : Ch 3, 2 dc in next st, dc in next 5 sts, join with sl st in first dc — (7 sts)
Leave enough yarn to sew the fin to the body.

Body :

Round 1 : Make a magic ring and work 4 dc in the ring, join with sl st in first dc — (4 sts)
Round 2 : Ch 3, 2 dc in each st, join with sl st in first dc — (8 sts)
Round 3 : Ch 3, [2 dc in next st, dc in next st] 4 times, join with sl st in first dc — (12 sts)
Round 4 : Ch 3, [2 dc in next st, dc in next 2 sts] 4 times, join with sl st in first dc — (16 sts)
Round 5 : Ch 3, [2 dc in next st, dc in next 3 sts] 4 times, join with sl st in first dc — (20 sts)
Round 6 : Ch 3, [2 dc in next st, dc in next 4 sts] 4 times, join with sl st in first dc — (24 sts)
Round 7 : Ch 3, [2 dc in next st, dc in next 5 sts] 4 times, join with sl st in first dc — (28 sts)
Round 8 : Ch 3, [2 dc in next st, dc in next 6 sts] 4 times, join with sl st in first dc — (32 sts)
Rounds 9-10 : Ch 3, dc in next 32 sts, join with sl st in first dc — (32 sts)
Round 11 : Ch 3, [dec, dc in next 14 sts] 2 times. From this point, crochet only in the back loops. Change color : with white yarn, join with sl st in first dc — (30 sts)
Round 12 : [sl st, ch, (2 dc, ch 2, sl st) in next st, sl st ] 10 times.
Weave the ends in.

Eyes:

Round 1 : With black yarn, make a magic ring and work 6 sc in the ring. Change color : with white yarn (leave a length of about 50 cm / 19.7″ or so before starting to crochet), join with sl st in first dc — (6 sts)
Round 2 : ch, 2 sc in each sts around, join with sl st in first dc — (12 sts)
Leave enough yarn to sew the eye to the body.
Now, using the length of white yarn we left aside, we’ll use surface crochet to hide the color change.
(The red arrows show where to insert your hook.)

If the pupil seems hidden beneath the white yarn around just push gently the white yarn with your fingernails.
Make another eye.

Assembling :

Start with the dorsal fin.

Weave in all ends.
You’re done ! ♥