Goldfish care guides

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Goldfish Care Guide

A definitive care guide for goldfish (Carassius auratus), covering both fancy varieties (ranchu, oranda, ryukin, lionhead) and single-tail types. Addresses the most common goldfish care myths and provides expert guidance on tank size, water quality, feeding, and disease prevention.

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Goldfish Tank Mates Guide

A compatibility guide for goldfish covering the best cold-water tank mates for both fancy and single-tail varieties, species to avoid, and why mixing goldfish with tropical fish doesn't work.

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Ranchu Goldfish Complete Guide

Carassius auratus

The Ranchu is the undisputed king of Japanese goldfish — a dorsalless, round-bodied fancy goldfish bred for over 200 years to embody a precise aesthetic ideal. Prized for its prominent head growth (wen), smooth arched back profile, and dignified swimming gait, the Ranchu is as much a living art form as it is a pet. Top-grade Ranchu from Japanese breeders can command thousands of pounds at auction, while the species remains accessible to dedicated hobbyists willing to invest in proper husbandry. This guide covers every aspect of Ranchu care — from tank configuration and water chemistry to wen development, breeding, and the judging standards that define excellence in this variety.

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Oranda Goldfish

Carassius auratus

The Oranda is one of the most beloved and recognisable fancy goldfish varieties, distinguished by its prominent fleshy head growth known as the wen. Available in a spectacular range of colours — including Red Cap (white body with red wen), Calico, Black, Blue, Chocolate, and Red — the Oranda combines the appeal of flowing, double-tail finnage with the unique character of the wen. Originally developed in China over 500 years ago, the Oranda remains a centrepiece of competitive goldfish showing and one of the most popular fancy goldfish varieties worldwide.

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Ryukin Goldfish

Carassius auratus

The Ryukin is one of the oldest and most recognisable fancy goldfish varieties, distinguished by its dramatic high dorsal hump, deep round body, and flowing double or butterfly tail. Named after the Ryukyu Islands (modern-day Okinawa, Japan), where the variety was developed from Chinese imports in the 17th century, the Ryukin remains a cornerstone of competitive goldfish showing in Japan and worldwide. Available in red, red-and-white, calico, and other colour forms, the Ryukin is hardy relative to other fancy varieties and an excellent choice for intermediate goldfish keepers.

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Lionhead Goldfish

Carassius auratus

The Lionhead is one of the oldest and most revered fancy goldfish varieties, prized in Chinese goldfish culture for over 500 years. Distinguished by the absence of a dorsal fin and the development of a full, prominent wen (head growth) that ideally covers the entire head, cheeks, and gill plates — resembling a lion's mane — the Lionhead is closely related to the Japanese Ranchu but maintains distinct breed characteristics. This guide covers the differences between Lionhead and Ranchu, care considerations specific to dorsal-less varieties, wen management, and optimal husbandry.