Betta pugnax Breeding Guide

Breeding the Penang Betta Betta pugnax: a robust stream-dwelling paternal mouthbrooder with a 9-16 day oral incubation and large free-swimming fry.

Overview

Betta pugnax is a robust, stream-dwelling paternal mouthbrooder. It grows larger than most wild bettas and the male incubates the eggs and fry in his mouth rather than building a nest. It is regarded as an intermediate breeding subject.

Sexing

Males are larger, with a greater amount of iridescent scaling on the head, a broader head shape, and more extended fins than females.

Conditioning

Bring breeding stock into condition with live and frozen foods such as Daphnia, Artemia and bloodworm. Well-conditioned fish are more inclined to court and spawn.

Breeding Setup

• Temperature: 22-28 C
• pH: 4.0-7.5
• Hardness: 18-179 ppm
• Use the tightest-fitting cover possible (some breeders use plastic wrap) to maintain warm humid air

A tight cover maintaining a warm humid air layer is important so the fry can develop the labyrinth organ correctly.

Spawning Behavior & Trigger

Following courtship the pair embrace and eggs and milt are released. The female catches the eggs on her anal fin, then the male collects them in his mouth; this cycle repeats until spawning concludes.

Egg & Fry Care

The incubation period is 9-16 days, after which the male begins to release free-swimming fry. The fry are large enough to accept motile foods such as microworm and Artemia nauplii immediately, although reports note that young fish may develop health issues from excessive Artemia. Perform small, regular water changes rather than large ones.

Common Challenges

Overreliance on Artemia has been linked to fry health problems, so the diet should be varied. As with other mouthbrooders, a disturbed holding male may spit out the brood early.