Naked-belly Spatuloricaria

Spatuloricaria gymnogaster is named for its anatomically distinctive unarmoured ventral surface (gymnos = naked, gaster = belly), which contrasts with the heavily plated dorsal surface typical of Loricariidae. It is native to the Magdalena and Cauca river basins in Colombia — the same inter-Andean valleys that harbour numerous other Colombian fish endemics. This species is rarely encountered in the aquarium trade and commands interest among Loricariidae specialists.

In the aquarium, Spatuloricaria gymnogaster requires clean, moderately flowing water with a soft substrate and good water quality maintenance. Its Colombian Andean river origins suggest a preference for water that is softer and slightly cooler than the warmest Amazonian conditions. The unarmoured belly means this species is potentially more vulnerable to abrasion from sharp substrates — fine sand is strongly recommended.

Breeding records are minimal for this species. Any successful breeding documentation would be of significant value to the specialist Loricariidae community.

Water: 22–27°C, pH 6.5–7.5, soft to moderate (GH 3–12); moderate flow; avoid sharp substrates. Tank: 200 L minimum; fine sand essential (unarmoured belly); driftwood and flat rock shelters. Feeding: Algae wafers, sinking pellets, blanched vegetables, occasional protein supplements. Breeding: Undocumented in captivity; presumed shelter spawner — document all observations. Compatibility: Peaceful; Colombian Magdalena biotope or large South American community.