Speckled Piranha (Serrasalmus spilopleura) Breeding Guide

Serrasalmus spilopleura (treated as a synonym of S. maculatus) is among the easier piranhas to spawn, laying adhesive eggs guarded by the male, but still demanding for hobbyists.

Overview

Serrasalmus spilopleura is widely treated in the literature as a synonym of Serrasalmus maculatus, the speckled or maculatus piranha, distributed through the Amazon, Rio Paraguay, Rio Parana and adjacent South American basins. According to Seriously Fish it reaches about 180-210 mm and is described as a continuous (non-seasonal) spawner in nature, and one of the easier members of the genus to breed in aquaria.

Sexing

Seriously Fish reports that no external sexual differences between the sexes have been recorded, although females ready to spawn appear noticeably swollen with eggs. Visual sexing outside the breeding season is therefore unreliable.

Conditioning

Adults are fed meaty foods such as whole mussels, cockles, whitebait, squid and earthworms; once mature, Seriously Fish recommends feeding only two or three times a week. Good water quality and varied feeding bring females into spawning condition, recognised by the swollen belly.

Breeding Setup

Seriously Fish notes that breeding this species is not a project for the average hobbyist and typically requires several large tanks. Suggested water values for keeping are 21-30 C, pH 6.5-7.5 and hardness 5-15 dH; spawning has been reported around 28 C.

Spawning Behavior & Trigger

The species lays adhesive eggs. Seriously Fish reports average broods of 800-1200 eggs. The male guards the nest and, when kept with the brood after spawning, becomes very aggressive toward anything approaching it.

Egg & Fry Care

According to Seriously Fish the eggs hatch in 54-58 hours at 28 C, and the fry become free-swimming within about a week. The guarding male defends the nest area during this period.

Common Challenges

The main difficulties are the large tank volume and the aggression of a guarding male, which requires careful management. While easier than other Serrasalmus, the species still demands significant space and resources.