Doitsu-goi (ドイツ鯉) originated by crossbreeding quite a few different recognized kinds with "scaleless" German carp (normally, fish with only an individual line of scales along both sides in the dorsal fin). Also written as 独逸鯉, four most important types of Doitsu scale designs exist. The commonest variety (referred to over) https://www.propanraya.com/cara-merawat-ikan-koi-agar-tetap-sehat-dan-indah-di-kolam-rumah