Electric Blue Jack Dempsey (Rocio octofasciata) - Live Fish

The Electric Blue Jack Dempsey (Rocio octofasciata), a variant of the regular Jack Dempsey Cichlid, is a stunning and popular freshwater fish known for its vibrant blue coloration and active, sometimes aggressive, nature. This fish is highly prized for its dazzling electric blue sheen, which makes it a striking addition to any aquarium. While its aggressive temperament and large size require special care, it can thrive in a well-maintained tank with the right environment.

Key Characteristics of the Electric Blue Jack Dempsey:

1. Appearance:

   • Coloration: The Electric Blue Jack Dempsey is most notable for its electric blue or turquoise-colored body, which is much more vibrant than the typical Jack Dempsey's darker colors. It often has a shimmer or metallic sheen that can be especially pronounced when viewed under proper lighting. Some individuals may have more prominent spots or iridescent hues on their scales, adding to their eye-catching look.
   • Size: These fish grow quite large, typically reaching a size of 8 to 10 inches (20 to 25 cm), although some can grow up to 12 inches (30 cm) in ideal conditions.
   • Body Shape: The Electric Blue Jack Dempsey has an elongated, oval-shaped body typical of cichlids, with a broad head and powerful jaws. The fins are often long and pointed, contributing to their dynamic swimming style.
   • Sexual Dimorphism: Males typically have larger size, more vivid coloration, and may show more fin extension, while females are generally smaller and less colorful.

2. Behavior:

   • Aggressive and Territorial: Like the regular Jack Dempsey, the Electric Blue variant can be quite aggressive, especially as it matures. They are highly territorial, particularly during breeding seasons, and can be aggressive toward other fish, especially those that invade their space.
   • Dominant: These fish can display dominance behaviors, chasing away other fish or defending their territory. They often establish a "home" within the tank, such as a specific rock or corner, which they fiercely protect.
   • Relatively Peaceful Tankmates: While they can be aggressive, they tend to do better in a species-only tank or with other large, robust fish that can hold their own, such as other cichlids, large catfish, or tough barbs. It's generally a good idea to avoid smaller or peaceful species, as they may be bullied or even eaten.

3. Diet:

   • Omnivorous: The Electric Blue Jack Dempsey is an omnivore and requires a well-rounded diet to thrive. In the wild, their diet consists of small fish, invertebrates, and plant material.
   • In captivity, you can provide them with:
     • High-quality cichlid pellets or flakes, which form the base of their diet
     • Live or frozen foods, such as bloodworms, brine shrimp, and daphnia
     • Vegetables like spinach, zucchini, or peas
     • Frozen or freeze-dried food like krill or shrimp
   • Feeding Frequency: These fish should be fed once or twice a day. Avoid overfeeding as it can lead to obesity and poor water quality.

4. Tank Requirements:

   • Tank Size: Electric Blue Jack Dempseys are large cichlids, and they need ample space to thrive. The minimum recommended tank size is 55 gallons (208 liters) for a single fish, but larger tanks (75 gallons or more) are preferred if you're keeping multiple fish or large tankmates.
   • Water Conditions:
     • Temperature: They prefer water temperatures between 78°F and 82°F (25°C - 28°C).
     • pH: A slightly acidic to neutral pH range of 6.5 to 7.5 is ideal.
     • Water Hardness: They prefer moderately hard water with a hardness of 10 to 20 dGH.
   • Water Quality: Electric Blue Jack Dempseys are sensitive to poor water quality, so it is essential to have good filtration and perform regular water changes (at least 25% per week) to maintain water clarity and reduce toxins like ammonia and nitrites.
   • Substrate: A smooth, fine gravel or sand substrate is best. Avoid sharp or jagged gravel, as it could harm their delicate fins or barbels.
   • Tank Décor: Provide rock formations, caves, and other hiding spots. These fish enjoy digging and rearranging their environment, so make sure the décor is secure. A few plants can be added, but they might get uprooted, as the Electric Blue Jack Dempsey tends to be a substrate digger.

5. Tankmates:

   • Compatible Tankmates: Due to their aggressive nature, Electric Blue Jack Dempseys should be housed with similarly aggressive or large fish. Consider keeping them with:
     • Other large cichlids, such as Oscar fish, Jack Dempsey (regular variety), Convict Cichlids, or Midnight Cichlids
     • Large catfish (e.g., Plecostomus, Synodontis)
     • Tough barbs, such as Tinfoil Barbs or Rainbowfish
   • Avoid Smaller or Peaceful Fish: These fish can be very territorial and aggressive toward smaller, peaceful species, so avoid housing them with fish like Tetras, Danios, or Guppies.

6. Lifespan:

   • Electric Blue Jack Dempseys can live up to 10 to 15 years with proper care and maintenance.