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Koi is using stones to chew her food
One of my Koi is clearly using a mouthful of rough gravel to chew her
food when I put a piece of meat in front of her. Then she spits the gravel out. This is in a 60 gallon aquarium. The bottom is covered with irregular rubble granite gravel with approximately 1/4" dimensions. The fish takes the food near the surface and then goes to the bottom and pulls up several such stones clearly chewing her food. Some of the small pieces of food will escape from her gills during this and then she spits out the stones. The other fish (I have only two in there) does not do this and the "tool user" does not pull stones into her mouth in this way (and keep them there) when she is foraging the bottom. Of course, they both move stones around with their mouths when they are searching. She also does not do this when she is eating "flake" food. |
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