Koi Can Blush

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Koi show stress by blushing red in their fins and on their bodies. When they are handled in a net you can see the red in their fins, between the spines. Also when they are in a stressful environment, such as bad water, they will often show a red blush on their bodies under the scales. Sometimes they almost look like they have varicose veins.

See the red in the front spines of the dorsal fin, and on the caudal fin.

If you see this they are trying to tell you something is causing them stress. Take measures to relieve the stress or you will start to lose Koi.

This is similar to when we blush from embarrassment or stress.

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