Videos on YouTube for education and just plain fun!
https://www.youtube.com/user/SOCOKOI/feed, Including:
How I Feed Oranges to Koi
Catch and Transport Koi
Exam and Injection of Sick Koi
Salt Dip for Koi
Koi Fire Rescue 2013
Hungry Koi Tosai
Other videos
Koi Pond Construction Tutorial, Courtesy of - The Pond Digger