Fold one corner of your A4 so that two edges of the paper align perfeectly.
Cut the excess paper off so you are left with a square piece of paper.
Fold in two opposite corners so that the edges of the paper line up with the centre crease.
Unfold these folds to see the square, then fold in half along the center fold (making a triangle).
Cut along the crease (only as far as to creat the backbone.
Stick the two uncut parts of your fish together (to creat the stomach).
Press down to flatten the head and cut off the pointy nose to make a rounded lip.
You need to add a tail and fins using your second colour (both you can cut to your desired shape).
Lastly, add your eyes, any size and shape you like.