Farlowella amazonum Breeding Guide

Breeding the Amazon Twig Catfish (Farlowella amazonum): an open spawner laying eggs on glass/wood, with the male guarding and fanning the clutch. Sexing, setup and fry care.

Overview

Farlowella amazonum is a slender twig catfish of the family Loricariidae from Amazon tributaries. Wikipedia describes Farlowella as having an extremely slender, elongated body resembling a thin stick of wood, with algae as the favourite food of the genus. Like other twig catfish it is an open spawner, not a cave spawner: eggs are attached to a flat vertical surface and the male alone guards and fans them.

Sexing

Mature males develop rows of odontodes (bristles) along the broadened snout/rostrum, which are absent in females; the male's snout is broader. As the TFH article notes for the group, these bristles are a useful sexing feature.

Conditioning

Condition adults on a vegetarian diet built around soft vegetable matter and algae (algae wafers, blanched vegetables) with occasional small live or frozen foods, in clean, well-oxygenated water with gentle to moderate flow and mature biofilm. Strong oxygen and current are important across the whiptail group.

Breeding Setup

Provide a mature tank with smooth vertical surfaces (glass or flat wood) for egg laying, soft water, brisk current and high oxygen. Maintain stable, clean water within the species' tolerated range of about 24-28 degrees C and pH 6.0-7.2; the TFH article stresses brisk current and ample oxygen as prerequisites for whiptails to spawn.

Spawning Behavior & Trigger

The female deposits an adhesive clutch on a vertical surface, very often the tank glass; the male then tends and fans the eggs, removing any that go bad, and drives the female away. In the genus, the male may be visited by additional females that add eggs to the brood. Water changes and a slightly cooler, softer regime are the usual triggers.

Egg & Fry Care

Per the genus, eggs hatch in roughly 5-7 days for F. amazonum (6-10 days reported in close relatives), with fry around 1 cm at hatching. The fry are particularly prone to starvation and need constant access to soft vegetable matter such as pre-softened greens and algae grown on surfaces; the TFH article notes that once the yolk sacs are used up they can be reared on algae, infusoria and finely powdered flake food.

Common Challenges

The fry are notoriously difficult to raise because they will starve without continuous grazing, so a steady supply of soft algae and vegetable food is the main hurdle; avoid foods that foul the water. Maintaining clean, oxygen-rich water and stable parameters throughout is equally important. Species-specific records are limited, so this leans on the documented Farlowella pattern; flagged for transparency.