Jikin Goldfish Heritage Strain Care Guide: Peacock Tail Heritage
Held up against a viewing window, the Jikin’s caudal split forms a perfect X — the peacock tail signature that has set this variety apart since the 1700s. The jikin goldfish heritage strain traces to Aichi Prefecture in central Japan, where local breeders developed the X-pattern double tail and the distinctive red-and-white “Rokurin” colour standard. This guide from Gensou Aquascaping at 5 Everton Park covers heritage, judging criteria, and Singapore sourcing realities for this rare collectible.
Heritage and Founding Locality
Jikin originated in Aichi Prefecture, central Honshu, around the 1700s from Wakin selective breeding. The variety was designated a Natural Monument by Aichi Prefecture in 1953, restricting export and supporting preservation breeding. Today only registered Aichi pond breeders produce pure Jikin, with the variety remaining one of the rarest goldfish heritage strains globally.
Signature Specialty
The Jikin is defined by its X-pattern caudal — the tail splits into four lobes that fan outward in a peacock-tail formation viewed from behind. The body retains a Wakin-like elongated form. Carassius auratus “Jikin” carries the unusual “Rokurin” (six-point) red-and-white pattern: red on lips, gill plates, pectoral fins, dorsal fin, and tail tips, with white body. Achieving this exact pattern requires manual scale removal during juvenile development.
Distinguishing Traits
Quality criteria include perfect X-pattern caudal symmetry, clean Rokurin red-on-white distribution, elongated Wakin body proportions, and clear dorsal fin definition. Imperfect tail symmetry or red bleeding into the body downgrades show valuation significantly. Adult body length 18-25cm with full pattern development represents prime show condition.
Genetics and Breeding
Jikin breeding involves stable Wakin-type body genetics combined with the X-pattern caudal trait. The Rokurin colouration is achieved through a combination of selective breeding and manual scale removal in juveniles to expose underlying white pigmentation in specific zones. This intensive technique limits production volume and contributes to the variety’s rarity.
Notable Specimens and Show Wins
The All-Aichi Jikin Show holds the highest prestige for this variety, with championship specimens carrying significant cultural weight. Top adult Jikin past 22cm with perfect X-tail and clean Rokurin command substantial JPY-equivalent valuations in private sales among Japanese collectors.
Singapore Sourcing
Jikin availability in Singapore is extremely limited due to Aichi Natural Monument restrictions and the variety’s small breeding population. Only specialist Japan-import services occasionally source Jikin, typically by special pre-order. The Carousell goldfish keeper community remains the primary network for any local resales. The aquarium tank range at Gensou stocks suitable larger-volume display options.
SGD Pricing Tiers
Juvenile Jikin from Japanese imports start at SGD 100-250. Yearlings with confirmed X-tail development and emerging Rokurin pattern run SGD 250-500. Adult show grade past 18cm with strong pattern reaches SGD 400-1,200, and premium Aichi-pedigreed tournament specimens command SGD 1,500-3,000+. Import freight and acclimation adds SGD 250-400 on top.
Care Considerations
Adult Jikin need 200-litre minimum tanks or pond housing with smooth-bottom substrate to protect the elongated tail. Cool water 18-26°C suits Singapore indoor ambient with chiller management. Strong filtration via a high-capacity canister filter handles the bioload. Feed quality sinking pellets and gel food twice daily, fasting one day weekly to prevent swim bladder issues.
Counterfeit and Mis-Sold Risk
Wakin and Tosakin crosses are sometimes mis-labelled as Jikin when they lack the X-pattern caudal or proper Rokurin colour distribution. Verify breeder identity through community vetting and request both side and rear-view photographs before any premium purchase. Aichi-pedigreed paperwork, when available, is the strongest authentication.
Modern Continuation
Aichi Prefecture continues to subsidise Jikin preservation through breeder grants and Natural Monument designation. International availability remains scarce, and Singapore receives only handful of specimens per year through specialist channels. Gensou Aquascaping recommends collectors interested in Jikin first establish Wakin-type goldfish husbandry experience before pursuing imports.
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