Characteristics

The Electric Blue Jack Dempsey (Rocio octofasciata) is a striking freshwater fish beloved by aquarium enthusiasts for its vibrant electric blue coloration. This cichlid originates from slow-moving warm rivers and lakes in Central America. Known for its semi-aggressive temperament, it is a hardy fish suitable for intermediate to experienced hobbyists. Ideal water conditions include a pH of 6.5–7.5, hardness of 8–15 dGH, and temperatures ranging from 24–28°C (75–82°F).

Origin and Distribution

Native to Central America, the Electric Blue Jack Dempsey is found in countries like Mexico, Honduras, and Guatemala. It thrives in calm, muddy waters, often surrounded by vegetation and sandy substrates. While the natural Electric Blue variant is rare in the wild, selective breeding has made it widely available in the aquarium trade.

Colors and Markings

The Electric Blue Jack Dempsey stands out for its shimmering blue scales, which cover most of its body. These vibrant hues are complemented by darker streaks and subtle spots, creating a mesmerizing contrast. Its elongated fins, sometimes tipped with iridescence, enhance its regal appearance.

Tankmates

Despite their semi-aggressive nature, Electric Blue Jack Dempseys can coexist with other robust or similarly sized fish. Suitable tankmates include:

• Firemouth Cichlids
• Convict Cichlids
• Plecostomus
• Rainbow Fish

Avoid keeping them with small, delicate fish such as neon tetras or guppies, as they may become targets.

Care Requirements

Maintaining optimal tank conditions is crucial for their health:

• Tank Size: Minimum of 55 gallons for one; larger tanks for communities.
• Water Quality: Regular water changes are essential to prevent nitrate buildup.
• Substrate and Decorations: Use sandy substrates with rocks and driftwood to mimic their natural habitat.
• Lighting: Moderate lighting enhances their colors without stressing the fish.

Diet and Feeding

Electric Blue Jack Dempseys are omnivores. In the wild, they consume insects, small crustaceans, and plant material. In captivity, they thrive on:

• High-quality pellets or flakes
• Frozen or live foods (bloodworms, brine shrimp)
• Occasional plant-based supplements like spirulina

Gender Differences

Males are generally larger and more vividly colored than females. During breeding seasons, males may develop longer, pointed dorsal and anal fins, while females show a rounder body shape.

Breeding

Breeding Electric Blue Jack Dempseys can be challenging due to their selective nature. To increase success:

1. Pair a healthy male and female in a separate breeding tank.
2. Set water conditions to pH 6.5–7.0 and a temperature of 26–28°C (78–82°F).
3. Provide flat surfaces for egg-laying, such as rocks or slate.

Once eggs are laid, both parents guard the nest. Fry can be fed baby brine shrimp or finely crushed fish food.

Additional Resources

For more about cichlid care or similar species, explore resources on:

• Green Terror Cichlids
• Dragon Blood Peacock Cichlids
• OB Peacock Cichlids

The Electric Blue Jack Dempsey is a breathtaking addition to any aquarium. With proper care and attention, it can thrive and become the centerpiece of your aquatic haven.