Jack Dempsey
Rocio octofasciata · Fish, Vertebrate, Cold-blooded, Wild (captive-bred)
Animal Family
Cichlidae, order Cichliformes, class Actinopterygii
Animal Category
Freshwater Animal
Breed / Variety
Electric Blue Jack Dempsey
Conservation Status
Least Concern (widespread in native range and common in the aquarium trade)
About This Creature
A robust, oval-shaped cichlid fish growing up to 8-10 inches long, characterized by a dark base body heavily covered in iridescent blue-green spots and flecks
Physical Characteristics
Deep, compressed body, large fleshy lips, spiny dorsal and anal fins, rounded caudal fin, and striking turquoise-blue or emerald spangling over a dark purple-grey background
Behavior & Temperament
Aggressive, territorial, and solitary outside of breeding pairs; known for digging in substrate and defending territory vigorously
Habitat & Diet
Origin Region
Central America, specifically from southern Mexico to Honduras, introduced elsewhere
Habitat
Freshwater rivers, streams, and warm, sluggish tropical waters; Aquatic
Diet & Nutrition
Carnivore; feeds on small fish, crustaceans, worms, and insects in the wild, and accepts prepared pellets and frozen foods in captivity
Lifespan & Health
Typically 10-15 years in captivity; prone to typical freshwater fish diseases like ich and hole-in-the-head disease if water quality is poor
Special Characteristics
Named after the 1920s heavyweight boxing champion Jack Dempsey due to its aggressive and pugnacious fighting behavior
Ecological Information
Acts as an opportunistic secondary consumer and predator in its native freshwater ecosystems, helping to regulate small fish and invertebrate populations