Hypoptopoma guentheri

Hypoptopoma guentheri honours the 19th-century German-British ichthyologist Albert Carl Ludwig Gotthilf Günther, one of the most prolific describers of freshwater fish of his era. The species belongs to the Hypoptopoma clade characterised by free-swimming behaviour, lateral eye placement, and spotted or reticulated body patterning that varies subtly between species. H. guentheri is a soft-water Amazonian species of moderate size.

In its natural Amazon basin habitat, H. guentheri is associated with the heavily vegetated margins of rivers and their floodplain lakes (várzea), where it forages over wood, roots, and aquatic plant surfaces. The species occupies a midwater niche that distinguishes it from the strictly benthic loricariids, and it is a capable swimmer able to traverse open water between grazing areas.

Aquarium keeping of H. guentheri is straightforward for experienced soft-water catfish keepers. It benefits from groups of three to six individuals in a spacious planted aquarium, where its active behaviour and subtle patterning can be fully appreciated. Algae wafers, blanched vegetables, and sinking prepared foods supplement its grazing. It is a good companion for other peaceful Amazonian species.

Water: Soft at pH 5.5–7.0 and 22–27°C; stable conditions with regular partial water changes. Tank: 80 litres minimum with swimming space, driftwood, and plants. Feeding: Algae wafers, blanched vegetables, spirulina discs; grazes naturally on aquarium surfaces. Breeding: Not documented in captivity. Compatibility: Peaceful with medium community species; suited to Amazonian biotope setups.