Step 1:
Fold a large paper square in half three times. If your paper gets to thick for folding, just cut off one prefolded strip. You also can just add eight paper quares together and fold the fishbone out of this 8x1 ratio paper.

Step 6:
Press flat

Step 5:
Fold over these two lines.

Step 2:
Fold both edges to the centerline and unfold the model afterwards.

Step 4:
Fold over these two lines, use the prefolded lines as guidance.

Step 3:
Valley-fold over the left line and mountain-fold over the right line.
The video ( link below these photo instructions ) shows more clear where to place these folds.

Step 10:
Fold along the edges.

Step 8:
Fold over these two lines.

Step 9:
Press flat.

Step 7:
Fold over these four lines, use the prefolded lines as guidance.

Step 16:
Fold over these lines.

Step 15:
Fold over these lines, turn the model afterwards.

Step 12:
Repeat steps 8 to 10 starting with these two lines.

Step 11:
Fold over these four lines, use the prefolded lines as guidance.

Step 14:
Repeat steps 8 to 10 starting with these two lines.

Step 13:
Fold over these four lines.

Step 21:
Fold these parts in half and curve them a little to the right.

Step 19:
Fold over these six lines.

Step 20:
Fold along the edges

Step 18:
Fold the corners backwards over the upper and lower line. And fold the tail into an angle over the two inner lines.

Step 17:
Fold these parts in half, the one on the right just a little.

Step 22:
Fold the left edge inwards to make a mouth. And fold the spot indicated by the arrow downwards, for making an eye.