Carp, Koi
If you're in Japan, the fish in your village are carp. You may know them as koi, too.
Picture your village in Japan. There's a big, still pond full of bright and beautiful giant carp. You hear the village kids giggle as they feed them and their big round mouths pop out of the water.
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こい
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A carp is called a koi (こい) in Japanese. We've used that word before so I hope you know it by now. A koi is a koi, you know?
Carp are koi and koi are carp. Blub blub.