This is a great tutoral on drawing our favorite fish.
 
Visiting a koi pond and watching the colorful, beautiful fish swim in the water is one of the most serene recreational activities. These aquatic beauties are called nishikigoi, or “brocaded carp” in Japanese, and come in a variety of colors and patterns. The architecture of their elaborate water gardens is designed to improve the health and growth of the fish, as well as provide decorative pleasure. Even if you can't keep your own koi pond, why not put your dreams to paper by drawing your own elegant fish?
 
Learn How to Draw Koi Fish With This Easy Step-By-Step Guide (mymodernmet.com)