Black Ghost Knifefish Breeding Guide

Breeding the black ghost knifefish (Apteronotus albifrons): a fractional spawner with electric gender signals, rarely bred at home and very challenging.

Overview

Apteronotus albifrons is a weakly electric, nocturnal knifefish of the order Gymnotiformes. Like other gymnotiforms it is a fractional spawner, releasing its sticky eggs irregularly rather than in a single mass. Its fecundity is low, reported to range from 1 to 105 eggs.

Sexing

The species communicates and recognises gender through its electric organ discharge (EOD): females generate EODs at a higher frequency than males, a frequency-modulation difference that can be used for gender recognition. Reliable external visual sexing is not documented.

Spawning Behavior & Trigger

Spawning occurs at night, with eggs deposited between roughly 11 pm and 2 am. The fish use their electrosensory object-location ability to hide eggs one at a time in tiny holes or gaps. When more than one male is present a single male is chosen to spawn and rivalry occurs between males. The species is a fractional (irregular) spawner.

Egg & Fry Care

The eggs are sticky and are concealed individually in small crevices. Because total fecundity is low (1 to 105 eggs) and eggs are scattered into hiding places rather than laid in a tended nest, locating and rearing fry is difficult. No detailed fry-rearing protocol is documented in the sources consulted.