May I feed the fish in the Administration Building pool?
Koi always look hungry when people approach the edge of the pool, but you needn’t feel sorry for them. We treat our koi better than they would be treated if they were in the wild. Koi are naturally gluttonous and are opportunistic feeders, but in a controlled environment we must regulate their intake of food to keep both the fish and their environment healthy. Over feeding the koi causes excessive amounts of fish waste, which contributes to more algae in the pool. To keep the algae down, we use barley straw extract which inhibits algae growth naturally. We also dye the water black using a nontoxic dye to keep the algae from growing excessively; a secondary benefit is that it gives the water a reflective look.
Visitors play an important role in helping us keep the fish healthy. When they do not feed them human food and do not touch them the fish thrive. Even though the fish look “petable,” touching them removes a natural slime layer, which they need as a natural barrier against disease. This layer serves as a sort of second skin.
The koi can still be enjoyed even though they aren’t being fed. See if you can pick out the butterfly koi—the ones with long fins—and “Big Momma,” who has gold scales and is our largest, oldest koi. She is over thirty years old!
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Last Updated September 5, 2011 2:55 PM
URL = http://www.usna.usda.gov/Gardens/faqs/PestAlert-EmeraldAshBorer.html