Breeding Chinese Algae Eater

Why Gyrinocheilus aymonieri is not bred in home aquaria: it is farmed for the trade with hormones, with only rare reported home fry and no reliable spawning triggers.

Overview

The Chinese Algae Eater (Gyrinocheilus aymonieri) is a common but problematic aquarium fish that is not bred in home aquaria. It is instead farmed for the trade in large numbers with the aid of hormones, so practical home breeding is effectively not an option.

Sexing

Young fish cannot be accurately sexed. Sexually mature females develop noticeably thicker bodies than males, and adult males in spawning condition develop noticeable tubercles on the snout.

Behaviour & Compatibility Warning

The species becomes increasingly territorial as it grows and can display particularly high levels of aggression toward similar-looking fishes. It may attach itself to the flanks of larger tankmates to feed on their body mucus, and in groups it develops a distinct pecking order in which weaker individuals are targeted. These traits make it a poor candidate for a community breeding setup.

Common Challenges

Because there are no reliable home-spawning triggers and the trade depends on hormone-induced farm breeding, hobbyists should not expect to reproduce this fish at home. The combination of late aggression and mucus-feeding behaviour further complicates keeping a breeding group.