• Appearance: They feature a solid black, matte, or glistening body. The Doitsu Karasu variety is particularly rare, characterized by having no scales and a smooth, leather-like skin.
• Flowing Fins: Their fins and barbels (whiskers) continue to grow throughout their lives, eventually resembling the wings of a butterfly or a “long, slinky dragon”.
• Size: They can grow to be quite large, often reaching 36 to 40 inches (91–101 cm) in a well-maintained pond.
• Hardiness: These koi are generally considered hardier and more disease-resistant than some of the more brightly colored, highly bred varieties.

主要特征

• 外观：它们体色呈纯黑色，有哑光和光泽三种。德国乌鱼（Doitsu Karasu）品种尤为罕见，其特点是无鳞，皮肤光滑如皮革。
• 飘逸的鳍：它们的鳍和触须（胡须）终生持续生长，最终形似蝴蝶的翅膀或“修长的龙”。
• 体型：它们可以长得相当大，在维护良好的池塘中通常可达 91 至 101 厘米（36 至 40 英寸）。
• 耐寒性：这些锦鲤通常比一些色彩鲜艳、高度人工培育的品种更耐寒，抗病能力更强。