原栖兵鲶 · Guaporé Cory

Overview

Gastrodermus guapore spends much of its time above the floor, gathering in midwater and taking some food from the water column. Large eyes, a forward-facing mouth, and a strongly forked tail accompany this behavior. Its feeding plan should reflect those differences from more strictly bottom-foraging corys.

Distribution & habitat

It is endemic to the Guaporé, called the Iténez in Bolivia, within the upper Madeira system of northeastern Bolivia and western Brazil. Main-channel records come from both countries; the extent into some tributaries remains tentative. The river has warm, clear, acidic water stained by tannins.

Aquarium setup

Use fine sand or thoroughly cleaned rounded gravel. Roots, branches, leaf litter, and surface vegetation provide security while leaving room for the group to swim above the substrate.

Diet & feeding

Its partial adaptation to catching pelagic zooplankton makes live water fleas, brine shrimp, and similar foods particularly useful. Suitable prepared or frozen foods can complement the menu according to acceptance. Do not leave these fish dependent on leftovers from other aquarium residents.

Behaviour & compatibility

A peaceful, social species, it should have at least four to six companions of its own kind. Groups frequently gather in midwater rather than spending all their time on the bottom.

Sexual dimorphism

Females typically grow larger and develop a wider, deeper body at maturity.

Breeding

Aquarium spawning is uncommon, but successful attempts resemble standard cory methods. Use a male-biased group and consider cooler replacement water with increased circulation and aeration once females are ripe. Glass, fine plants, and submerged mops can receive the eggs, with mops simplifying transfer.

Separate adults and eggs after laying. Maintain matching water and good oxygenation during incubation and monitor fungal losses. Hatching normally takes three or four days. Microworms and brine shrimp nauplii become suitable after yolk absorption. The fry require excellent water quality, and a thin sand layer appears preferable to a wholly bare floor.

Notes

Similar tail markings do not imply identical body shape or feeding behavior in related catfishes. Compare eyes, mouth position, tail shape, and activity when assessing identity. Occasional air gulps are normal; sharp pectoral spines require care during handling.