Meaning
口子 (くちこ, Kuchiko) is Kuchiko, a Japanese food (viscera).
What is Kuchiko?
Kuchiko are the gonads of sea cucumbers. The gonads are located slightly under the mouth, so they are commonly called " kuchiko ". The sea cucumber reaches its breeding season from January to March when it is deep winter. The gonads then develop and enlarge. They are also known as hochiko and bachiko . Kuchiko usually is formed in flat triangular shapes and dried.