Dwarf Pike Cichlid

Geographic Origin and Biotope: Endemic to the Tocantins River basin in Brazil, a clearwater system. Lives exclusively in strong rapids (rheophilic), hiding among crevices of rocks and pebbles.

Taxonomy and Morphology: Dwarf Pike Cichlid (Crenicichla compressiceps). One of the smallest members of the vast Pike Cichlid genus. The name derives from the strongly laterally compressed head, adapted to slip between rocks.

Social Behavior: Extremely territorial with conspecifics, especially males among themselves. In nature it lives solitary or in pairs tied to rocky crevices. Aggressive if the territory is violated.

Coloration and Sexual Dimorphism: Pale yellow-green slender torpedo body, adorned with distinctive 6-8 dark vertical stripes and yellow nuances on the fins. Males have more prominent vertical stripes on the anal and dorsal fin.

Aquarium Setup: A rheophilic aquarium is indispensable: strong water movement (circulation pumps), pebbly sand substrate and lots of smooth rocks piled up to create labyrinths and crevices (multiple hiding places to dissipate aggression).

Diet and Feeding: Specialized carnivorous micro-predator. Actively hunts small invertebrates and fry. In the aquarium it needs bloodworms, mysis, krill, mealworms and insects. With difficulty it gets used to sinking carnivorous pellets.

Water Quality: Extremely demanding: the water must be super-oxygenated and impeccable (nitrates < 15 ppm). Massive water changes and an oversized filter are a must for this fast-water species.

Compatibility and Tankmates: Can only coexist with fast, robust fish occupying the upper part of the aquarium (e.g. large current Characins, hatchetfish, or large rheophilic Loricariids like Chaetostoma). Devours small fish.

Aquarium Reproduction: Lays eggs (about 50) in very narrow caves or dark ravines between the rocks. The female guards the eggs inside while the ruthless male defends a large outer perimeter.

Risks and Diseases: Dies of hypoxia and systemic stress if there is not enough current or if the water is minimally polluted. Tendency to jump out (closed tank!).