Both sides of the square piece of paper are coloured.
Step
1:This is the front of the paper.
Make a mountain-fold over the pink line.
Step 2:
Make a valley-fold over this line. Make this fold over the
upper layer of the model.
Step 3:
Make a valley-fold over this line.
The piece at the arrow is pulled to the left
when you make this fold.
Step 4:
Press on the place at the arrow to make everything flat.
Step 5:
Repeat step 3 and 4 on the other side of the model, see
the pink line.
Step 6:
Turn the model.
The origami fish is ready!
