Pearlscale Goldfish

Pearlscale Goldfish (Carassius auratus) is one of the most distinctive and unusual fancy goldfish varieties — and one of the most immediately recognizable. Each scale has a raised, rounded dome at its center, giving the entire body a pearl-like texture of convex circular discs. Combined with the most spherical, ball-like body shape of any goldfish variety, the Pearlscale is genuinely unlike any other fish in the hobby.

Feeding & Care Tip: Hikari Fancy Goldfish slow-sinking pellets are the ideal staple for fancy goldfish — the slow sink rate gives these slower-swimming varieties time to feed without gulping air at the surface, which can cause swim bladder problems. Sera Goldy Color Spirulina enhances red and orange coloration. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Baby Brine Shrimp or Hikari Frozen Daphnia. If keeping alongside slim-bodied goldfish, offer Hikari Goldfish floating pellets at the same time — the slim-bodied fish will take the floating food while the fancies feed at their preferred mid-water level, ensuring both types eat well.

The domed scale structure of the Pearlscale is a genetic mutation affecting scale calcification — the raised calcium carbonate center of each scale creates the characteristic pearl dome. If a scale is lost or damaged, the replacement scale is often flat rather than domed — a normal occurrence that does not affect the fish's health. The extremely round body makes the Pearlscale one of the slower-swimming fancy goldfish.

Keep in groups of two or more. The Pearlscale is one of the more delicate fancy goldfish due to its extreme body shape — the very round body puts pressure on the swim bladder and can make this variety more prone to buoyancy issues. Feeding Hikari Fancy Goldfish slow-sinking pellets rather than surface-feeding foods reduces the risk of gulping air. Fancy goldfish require a larger aquarium than most people expect — a minimum of 20 gallons for a single fish, with an additional 10 gallons per additional fish. A long, wide tank is preferable to a tall, narrow one — fancy goldfish spend most of their time in the lower half of the water column and benefit more from bottom area than height. Gentle filtration that moves the water without creating strong currents is ideal — the egg-shaped body of fancy goldfish makes them poor swimmers in turbulent water.

Goldfish are among the longest-lived aquarium fish — well-kept fancy goldfish regularly reach 10–15 years with excellent care. The investment in appropriate tank size, good filtration, and regular water changes is rewarded with a fish that becomes a genuine long-term companion. Filtration & Water Quality: Goldfish are high-waste fish that require robust filtration — significantly more than most tropical fish of equivalent size. A filter rated for at least twice the tank volume is recommended. Regular partial water changes of 25–30% weekly are essential. Despite their reputation as 'easy' fish, goldfish kept in under-filtered or overcrowded conditions decline quickly. Good filtration is the single most important factor in keeping goldfish healthy and long-lived.

Care & Ideal Parameters