Slender Tetra Breeding Guide
Breeding the Slender Tetra (Iguanodectes spilurus): sexing by nuptial males and an egg-scattering approach; aquarium spawning is largely undocumented.
Overview
The Slender Tetra (Iguanodectes spilurus) is a long, slender characid found in the Amazon, Essequibo, Orinoco and Tocantins river basins of South America, where it occurs in fast-flowing creeks. FishBase records that it spawns in intervals, but Seriously Fish provides no documented account of successful captive breeding, so the points below describe the general egg-scattering approach used for soft-water tetras.
Sexing
Seriously Fish notes that nuptial males develop hooks and lappets on the anterior anal-fin rays, which is the most reliable sexing cue when males are in breeding condition.
Conditioning
As a general egg-scatterer approach, condition the sexes on small live and frozen foods until females are visibly rounded with eggs before moving selected fish to a separate spawning tank.
Breeding Setup
- A dimly lit spawning tank, following the general soft-water tetra approach.
- Soft, slightly acidic water within the species' range: temperature about 23-27 C, pH 5.0-7.5, hardness up to 18 dH (FishBase).
- Fine-leaved plants or spawning mops, or a mesh base, to protect scattered eggs from the adults.
- Gentle filtration via an air-powered sponge filter.
Spawning Behavior & Trigger
Because aquarium spawning is undocumented, behaviour is inferred from related egg-scattering tetras: eggs would be scattered among plants or fall through a mesh base, and the adults should be removed promptly to prevent egg predation. FishBase notes only that the species spawns in intervals.
Egg & Fry Care
No species-specific egg or fry data are documented. Following the general tetra approach, free-swimming fry would be started on infusoria-type foods and moved on to microworm and brine shrimp nauplii as they grow.
Common Challenges
The main limitation is the absence of documented captive breeding, so a confirmed protocol does not exist for this species. Replicating its soft, fast-flowing creek water and conditioning ripe females are the key preliminaries.