The origami scheme of the fish is considered in the article. Origami fish is done like this:
1. Make an inflection and bend the sheet along the other diagonal.
2. Fold the corners.
3. Fold the top layer up.
4. Open the corners.
5. Bend the lower corner of the dotted line.
6. Make another bend.
7. Make the cuts.
8. Bend the triangle back.
9. Turn the figure to yourself sideways.
10. Stretch the figure.
11. Origami fish ready.