Showa Sanshoku
A variant of Koi (Cyprinus rubrofuscus)

Representative Koiphoto — a dedicated image of this exact morph isn't available yet.
Black-bodied tricolor with red and white, where the black wraps the body including the head in bold motoguro patterns. Distinguished from Sanke by black on the head and at the fin joints.
Keeper tips for this variant
Judge young Showa patiently — the sumi develops and shifts for years, so don't over-select for finished black in juveniles; feed a balanced (not color-heavy) diet to let sumi mature naturally.