Channa asiatica Breeding Guide

Breeding the cool-tolerant Channa asiatica: a biparental free spawner whose floating eggs hatch in 24-36 hours and whose tadpole-like fry must be size-sorted to avoid cannibalism.

Overview

Channa asiatica is a subtropical East Asian snakehead that tolerates cool water. Reproduction is by free-floating eggs with biparental guarding: no bubble nest is built and several thousand eggs simply float at the surface, with both male and female remaining to defend the eggs and fry. It is an obligate predator.

Sexing

Males develop more-extended dorsal and anal fins and possess far more silvery spots on the body and fins than females. Adult females tend to appear rounder-bellied than males.

Conditioning

As an obligate predator the species takes shrimp, earthworms and superworms, along with frozen prawns, mussels and pieces of whole fish. Mature fish of around 18 cm or larger will usually breed at least once a year when well conditioned.

Breeding Setup

• Temperature: 15-25 C
• pH: 6.0-8.0
• Hardness: 90-447 ppm
• Minimum breeding size: approximately 18 cm

Spawning Behavior & Trigger

The male and female embrace in a manner similar to that seen in gouramis, bettas and other anabantoids. After spawning the buoyant eggs float at the surface and are guarded by both parents.

Egg & Fry Care

Eggs hatch within 24-36 hours depending on temperature, and the fry become free-swimming in a further 24 hours. Initial fry resemble 6-7 mm long black tadpoles and require large amounts of small live foods such as Artemia nauplii, cyclops and Daphnia. Weekly size-sorting of the growing fry is essential to prevent cannibalism.

Common Challenges

Cannibalism among unevenly grown fry is the main threat to a brood, so regular grading by size is necessary. As with all snakeheads, a tightly covered tank is required because the species jumps.