Breeding Otocinclus
How to breed Otocinclus (Otocinclus vittatus): sexing, protein conditioning, a water-change trigger, T-position spawning, adhesive eggs and biofilm-fed fry.
Overview
Otocinclus (Otocinclus vittatus) is an egg-laying catfish of advanced breeding difficulty. It spawns in the cory-like T-position, depositing adhesive eggs on surfaces, but the tiny fry are challenging to feed, which is the main reason breeding is considered difficult.
Sexing
Females are a little bigger and broader than males, especially when full of eggs and viewed from above.
Conditioning the Breeders
Feed plenty of their normal foods plus added protein such as live and frozen baby brine shrimp and microworms to bring the fish into spawning condition.
Breeding Setup
- A mature, well-established tank with good biofilm and surfaces for egg attachment
- Broad plant leaves and glass surfaces where the female can deposit eggs
- Water within the species range of 21-26 °C
- Gentle flow from a sponge filter, suited to the very small fry
Spawning Behavior & Trigger
Some hobbyists induce breeding with 50% water changes to imitate seasonal flooding and heavy rainfall. The mating pair forms a T-position, and the female then lays adhesive eggs on plant leaves and other surfaces in clutches of 30-40 eggs, which should be removed or they may be eaten.
Egg & Fry Care
Move the eggs to a hatching container with an air stone; they hatch after about three days. The very small fry can feed on green water, soft surface algae, spirulina powder, live paramecium, soft vegetables and tiny 5-50 micron powdered foods, later progressing to live baby brine shrimp.
Common Challenges
Fry losses are common because the tiny fry cannot eat larger foods until they grow; an established biofilm and microscopic foods such as infusoria and rotifers are essential. The eggs can be very sticky and hard to roll off surfaces when relocating them.