The Jewelfish is a vibrant African cichlid with intense red coloration and a strongly territorial temperament. Best suited for experienced aquarists.
Overview
The Jewelfish (Hemichromis bimaculatus) is one of the most visually striking African cichlids, captivating aquarists worldwide with its incredibly intense red coloration. This species belongs to the family Cichlidae and originates from the rivers and lakes of West and Central Africa, where it inhabits a wide range of biotopes — from slow-flowing rivers to swampy areas.
Adults reach a size of 8–10 cm, making them a medium-sized cichlid. The body is elongated and slightly laterally compressed. The species' hallmark is its vivid red body coloration adorned with blue-green iridescent spots, which become especially intense during spawning. Two characteristic dark spots — one on the gill cover and another in the middle of the body — give this species its common name "Two-Spotted Jewelfish."
What Makes This Species Unique
- Stunning coloration: During spawning, the Jewelfish becomes one of the most colorful freshwater fish — the entire body takes on an intense crimson hue covered in shimmering blue dots.
- Dedicated parental care: Both parents actively guard the eggs and fry, which is remarkable even among cichlids.
- Predatory character: Despite its modest size, this is an active and determined predator with a strongly territorial disposition.
How to Distinguish Males from Females
Sexual dimorphism in Hemichromis bimaculatus is moderate:
- Males are generally larger and more brightly colored, with more pointed and elongated fins.
- Females are smaller and have a rounder belly, especially when ready to spawn.
- During the breeding season, both sexes intensify their coloration significantly, but males typically display more vivid colors.
Tank Requirements
A comfortable setup for the Jewelfish requires an aquarium of at least 100 liters for a pair. This is a territorial fish, and insufficient space leads to increased aggression.
Water parameters:
- Temperature: 24–28°C
- pH: 6.5–7.5
- Hardness (GH): 10–15 dGH
Aquarium setup:
- Substrate: Sand or fine gravel. Jewelfish enjoy digging in the substrate, so larger rocks should be placed directly on the tank bottom, not on top of the substrate.
- Hiding spots: Plenty of shelters are essential — driftwood, rocks, ceramic pots. This allows the fish to establish territories and reduces stress levels.
- Plants: Use hardy species such as anubias and Java fern attached to driftwood. Plants rooted in the substrate will be uprooted.
- Filtration: A powerful external filter is essential, as Jewelfish produce a significant biological load.
Feeding and Diet
The Jewelfish is a predominantly carnivorous fish with high protein requirements. In the wild, it hunts small fish, insects, their larvae, and other invertebrates.
Aquarium diet:
- Live and frozen foods (dietary staple): bloodworms, brine shrimp, glassworms, small gammarus, daphnia.
- Quality dry foods: pellets and flakes designed for cichlids with high protein content.
- Supplementary foods: pieces of shrimp, mussels, fish fillet.
- Plant-based additions: small amounts of spirulina or blanched vegetables for balance.
Feed 1–2 times daily in small portions. Overfeeding leads to obesity and deteriorating water quality. A fasting day once a week is recommended.
Care and Maintenance
The Jewelfish is a fairly hardy species with a moderate care level, but it requires an attentive approach due to its temperament. Life expectancy is 5–7 years with proper care.
Regular maintenance:
- Weekly water changes — 25–30% of the tank volume.
- Monitor water parameters with test kits (ammonia and nitrites are especially critical).
- Clean the filter as needed (typically every 2–3 weeks).
- Inspect fish for signs of illness: faded coloration, loss of appetite, frayed fins.
Common health issues:
- Hexamita (hole-in-the-head disease) — a typical cichlid ailment that manifests as ulcers on the head. Triggered by stress and poor water quality.
- Ichthyophthirius (white spot disease) — white dots on the body. Treated by raising temperature to 30°C and medication.
- Bacterial fin infections — usually the result of injuries from conflicts. Treated with antibacterial medications.
Compatibility
The Jewelfish has a strongly territorial character (aggression level 4 out of 5), which significantly limits the choice of tankmates. Fish become especially aggressive during spawning when guarding their clutch and fry.
Suitable tankmates:
- Large, active fish capable of holding their own: Blue Acara, large barbs.
- Bottom-dwelling species: large Synodontis catfish, plecos.
- Other cichlids of similar size and temperament, provided there is sufficient space.
Unsuitable tankmates:
- Small fish (neons, guppies, rasboras) — will be treated as prey.
- Peaceful, slow-moving species — will become targets of constant harassment.
- Other Hemichromis species, such as the Blood-Red Jewel Cichlid — territorial competition.
The optimal choice for beginners is a species-only tank with a single pair. This allows you to observe the fish's natural behavior without the risk of conflicts with tankmates.
Breeding
Breeding Hemichromis bimaculatus in a home aquarium is not particularly difficult (difficulty level 3 out of 5), as pairs will spawn readily and regularly under comfortable conditions.
Spawning preparation:
- An established pair is best moved to a separate breeding tank of at least 80 liters.
- Raise the temperature to the upper end of the range (27–28°C).
- Provide flat stones, ceramic tiles, or pots as spawning substrates.
- Increase the proportion of live foods in the diet.
Spawning process and development:
The female lays 200 to 500 eggs on a pre-cleaned flat surface. Both parents actively guard the clutch, fanning the eggs with their fins and removing unfertilized ones. Incubation takes 2–3 days at 27°C. After hatching, the larvae remain on the substrate for another 3–5 days, feeding on their yolk sacs. Once the fry become free-swimming, they should be fed brine shrimp nauplii and microworms.
The parents continue to guard the fry for several weeks, but as the offspring grow, the adults' aggression may increase — at this point, the fry should be moved to a separate grow-out tank.