Nankin

The Nankin is a rare, selectively bred goldfish variety developed in Japan. Its distinguishing features are the absence of a dorsal fin and a compact, egg-shaped body. The head is small, without the characteristic growths found in many other breeds. The caudal fin is forked and short; when viewed from above, the fish's body often resembles a triangle. The traditional coloration combines white and red, with specimens valued for a harmonious distribution of these hues.

This species is not found in nature, as it is an entirely artificially bred ornamental form. Historically, the breed was developed in the Izumo region (Shimane Prefecture, Japan) in the mid-18th century. In aquarium conditions, the fish require a stable environment typical for ornamental goldfish, with clean water and no strong currents.

The Nankin is characterized by a calm, phlegmatic temperament. Due to its body structure and the absence of a dorsal fin, the fish are rather weak swimmers. It is recommended to keep them in a species-specific aquarium or with other slow-moving goldfish varieties. Active and fast fish species may compete with the Nankin for food or injure it.

For keeping one adult specimen, an aquarium of 40-50 liters or more is required, but more spacious tanks are preferable. Effective filtration and regular water changes are important, as the breed is sensitive to water quality. The decor should avoid sharp objects and decorations that could damage fins or the body. Lighting should be moderate.

The fish are omnivorous and undemanding in their food choices. The diet should be balanced and include both high-quality dry foods, as well as plant supplements or frozen products. It is important to control portion sizes to avoid overfeeding and water pollution. Feeding is recommended 1-2 times a day in small portions.

Nankin breeding is considered a challenging task that requires experience. Spawning is stimulated by increasing water temperature during spring. The fish lay eggs on fine-leaved plants or special substrates. Fry require meticulous care, regular sorting, and high-quality starter food for the proper development of the body shape characteristic of the breed.

The species is susceptible to diseases typical for goldfish, including bacterial infections and parasitic infestations, often arising from poor water quality or stress. Due to the absence of a dorsal fin and their body shape, the fish may be prone to swim bladder disorders. Prevention involves maintaining cleanliness and stable water parameters.

When purchasing, one should choose active individuals with clean fins and no visible body damage. It is important to pay attention to the symmetry of the body shape and the absence of signs of emaciation or diseases, such as white spots or film. Given the rarity of the breed, it is best to acquire them from specialized breeders, as Nankin are extremely rare in general sale.