Materials
Square paper
Black marker
Scissors
Eye stickers (optional)
Steps
1. Place the square paper face up, along the two pairs of Diagonal lines Fold the paper in half twice and then open it. You can see that two diagonal lines are formed on the paper that intersect each other perpendicularly. Now place the paper horizontally. 
2. After turning the origami paper over, fold it in half up and down, with the fold line facing up. 
3. Then fold both sides of the paper inward along the fold lines, as shown in the picture, forming an isosceles right triangle. 
4. Now rotate the triangle origami ninety degrees so that the right angle faces the left. Then use a marker to draw a triangle at each of the two base corners of the right triangle to form a tropical fish tail. The shape.
5. Cut off the part outside the marked line; draw a circle on the white paper, draw a small black circle inside the circle, and then put the circle Cut it out and paste it at a right angle as the eyes. The eyes can also be completed with stickers; finally draw the mouth.
You’re done
Origami tropical fish completed .
