Jack Dempsey
Also known as: Rocio octofasciata
The Jack Dempsey (Rocio octofasciata) is a strikingly colored freshwater cichlid known for its iridescent blue-green spots and aggressive demeanor. The Jack Dempsey originates from Native to slow-moving rivers, streams, and lakes in Central America, including Mexico, Guatemala, Honduras, and Belize., reaches 25 cm in captivity, typically lives 10, and is kept at 24C (75F). Individual fish vary, so treat this as a general guide rather than a guarantee.
Species at a glance
- Origin
- Native to slow-moving rivers, streams, and lakes in Central America, including Mexico, Guatemala, Honduras, and Belize.
- Adult size
- 25 cm (10 in)
- Life span
- 10
- Temperament
- Aggressive and territorial, especially during breeding; best kept singly or as a mated pair in species-only tanks.
- Tank size
- 208 L (55 gal)
- Water temp
- 24C (75F)
- pH range
- pH 6.5-8.0
- Diet
- Omnivorous; feeds on high-quality cichlid pellets, frozen or live foods like bloodworms, brine shrimp, and chopped earthworms, supplemented with blanched vegetables such as zucchini and spinach.
- Other names
- Rocio octofasciata
About the Jack Dempsey
The Jack Dempsey (Rocio octofasciata) is a strikingly colored freshwater cichlid known for its iridescent blue-green spots and aggressive demeanor. Native to Central American waters, it thrives in warm, slightly acidic to neutral conditions. Adults develop intense coloration, especially males, with elongated fins and a robust body. Despite their beauty, they require experienced handling due to their territorial nature and need for spacious, well-structured environments.
Lifespan and health
With optimal care, Jack Dempseys typically live 8–12 years in captivity, with some individuals reaching up to 15 years in exceptionally well-maintained environments. Longevity is directly tied to stable water quality, proper nutrition, and minimal stress from aggression or overcrowding. Regular monitoring of behavior and appetite is essential, as declines often precede illness. Common health issues include hole-in-the-head disease (linked to poor water quality and vitamin deficiencies), ich (white spot disease) during temperature fluctuations, and bacterial infections from fin nipping or injuries. Preventative measures include maintaining pristine water, providing a vitamin-rich diet, quarantining new fish, and promptly treating any signs of disease with appropriate medications under veterinary guidance.
Overview
The Jack Dempsey (Rocio octofasciata) is a strikingly colored freshwater cichlid known for its iridescent blue-green spots and aggressive demeanor. Native to Central American waters, it thrives in warm, slightly acidic to neutral conditions. Adults develop intense coloration, especially males, with elongated fins and a robust body. Despite their beauty, they require experienced handling due to their territorial nature and need for spacious, well-structured environments.
Care and tank setup
Tank setup should include a minimum 208-liter (55-gallon) aquarium with a sandy substrate, ample hiding places using driftwood, rocks, and caves, and moderate to strong filtration to handle their waste output. Avoid sharp decorations that could injure their fins. Water parameters must be maintained at 24–28°C (75–82°F) with a pH between 6.5 and 8.0; perform 25–30% weekly water changes to keep nitrates below 20 ppm. Feed a varied diet 2–3 times daily, offering only what they can consume in 2–3 minutes to prevent overfeeding and water quality degradation. Due to their aggression, suitable tankmates are limited; consider only robust, similarly sized cichlids like Convicts or Firemouths in very large tanks (300+ liters), but solitary housing is strongly recommended for long-term success.
Related breeds
Breed information on this page is based on the Wikipedia article on the Jack Dempsey, supplemented with additional research. Reviewed for accuracy.