Here is an example of different terminology used in translation.  The article title tells the reader this is about koi fish, then gives the scientific name of Anabas testudineus.  Anabas testudineus is a type of Perch found in India, not a koi. When I read research papers, I am often surprised at how little I know and how much I must learn.  However, this article is a good example of the efforts being made to reduce the cost of fish feed.  It should be noted that in the fish feed industry, serious investment is focused on the raising of fish for human consumption.  Research often focuses on how much you can replace fish meal with an alternative protein source. Take note of these research papers, as like this one, the fingerlings are only fed for 60 days. Fish feed ingredients tested in these research efforts were never tested for long term growth of koi collection.  Buyer beware on ingredients tested short term care when feeding your collection. 
 
"Background In India, fishmeal is habitually considered as the major protein source for fish culture. Rising cost, deteriorating quality and unavailability of fishmeal caused huge difficulty in modern aquaculture, particularly for fish nutrition. Nearly all Anabas testudineus cultures faced loss, due to high feed costs, inappropriate feed formulation and management."
 
https://www.academia.edu/29386787/Growth_performance_study_of_Koi_fish_A...