Paratheraps fenestratus Breeding Guide

Breeding notes for Paratheraps fenestratus (Vieja fenestrata), a Mexican substrate spawner whose eggs hatch in 2-3 days with attentive biparental care.

Overview

The record name Paratheraps fenestratus refers to the same fish widely listed as Vieja fenestrata. According to Seriously Fish it is endemic to western Mexico between the Papaloapan and Chachalacas rivers, where it predominantly inhabits clear lakes with sandy or muddy substrates and beds of aquatic plants, and also occurs in slower river sections. It reaches about 12 inches (30 cm) standard length.

Sexing

Seriously Fish reports that males are larger and more vibrant, display a nuchal hump, and have extended dorsal and anal fins compared with females.

Breeding Setup

Seriously Fish lists a temperature of 74-86 degrees F (23-30 degrees C), a pH around 7.0 and hardness up to about 15 degrees H. A breeding tank should be roomy with neutral, moderately hard water and a sand substrate plus large flat stones, reflecting the natural habitat. The Aquairi record classifies the species as a substrate spawner of intermediate breeding difficulty.

Spawning Behavior & Trigger

Seriously Fish describes the pair selecting a large stone or sometimes a cave as the spawning site, removing debris before spawning begins. The male may show aggression during this phase, and if it becomes excessive the female should be removed.

Egg & Fry Care

According to Seriously Fish the eggs hatch within 2-3 days and the fry become free-swimming about four days later. Initial food consists of newly hatched brine shrimp, progressing to microworms and fry foods. The adults make excellent parents but can turn aggressive toward their offspring when ready to spawn again, so the fry should be removed at that point.