Redcap Oranda

The Oranda “Redcap” is a selective short-bodied form of goldfish with an ovoid body and well-developed fins. A distinctive feature is a massive fatty growth on the head, called a “cap,” which is bright red. The main body and fin coloration is snow-white. The caudal fin is bifurcated and flowing. Adult specimens can reach 18-23 cm in length. Sexual dimorphism is weakly expressed: it is difficult to distinguish males and females during normal times.

The “Redcap” is a selective form of goldfish (Carassius auratus), bred artificially, so this species is not found in the wild. Its natural ancestor, the silver crucian carp, inhabits freshwater bodies with slow currents or stagnant water, preferring eutrophic environments rich in nutrients and aquatic vegetation. In their natural environment, these fish stay in small groups, primarily in the bottom layers of the water.

This is a calm and peaceful fish, leading a sedentary lifestyle. Due to the peculiarities of their body and fin structure, “Redcaps” are weak swimmers, so it is not recommended to keep them with active or aggressive species that could damage their fins or steal food. They are social and feel best in a group of their own kind or other slow-moving goldfish.

A single specimen requires an aquarium of at least 75 liters, while a group needs significantly more. Powerful filtration and regular aeration are essential, as these fish create a high biological load and are sensitive to water quality. The temperature regime should be 18-22°C. Sand or smooth gravel without sharp edges that could damage the head growth is preferred as substrate. The decor should exclude sharp ornaments.

Omnivorous, their diet should include both plant and animal components. It is recommended to use high-quality specialized goldfish foods in the form of pellets or flakes. To improve digestion, it is beneficial to supplement their diet with blanched vegetables (spinach, lettuce, peas) and live or frozen foods (Artemia, Daphnia, bloodworms). It is important to avoid overfeeding, as these fish are prone to obesity.

Sexual maturity occurs at 1.5-2 years of age. A separate spawning tank of 30-50 liters with fine-leaved plants and sandy substrate is required for breeding. Water changes and a temperature increase of 3-5 degrees serve as a stimulus. During the breeding season, males develop characteristic white spots – “breeding tubercles” – on their gill covers and pectoral fins. After spawning, the parents must be removed to prevent them from eating the eggs.

Most susceptible to infections due to water pollution and injuries to the head growth. Bacterial and fungal infections, as well as ichthyophthiriasis, are common. Due to their unique body shape, these fish are prone to swim bladder disorders, which manifest as loss of balance and swimming on their side or upside down. Prevention includes maintaining clean water, regular water changes, and controlling diet quality.

When purchasing, choose active fish with clean skin and no visible damage to the head or fins. The head growth should be evenly developed, without signs of rot, ulcers, or unnatural coatings. Avoid specimens that appear emaciated, lethargic, or constantly stay near the water surface, as this may indicate swim bladder problems or general intoxication in the store environment.