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Fish Freshwater Care: easy Peaceful

Porthole Livebearer

Poeciliopsis gracilis
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Other names: Poeciliopsis, Poeciliopsis gracilis
Group: Livebearers · Family: Poeciliidae · Origin: Central America — rivers and ponds of southern Mexico, Guatemala and Honduras

A plain, peaceful Central American livebearer recognized by a row of round black spots along the middle of its body, resembling a ship's portholes. It is hardy and suits community aquariums.

Will it suit my tank?

Last updated October 16, 2026

Temperature
22–28°C
pH
7–8
Hardness
8–20 dGH
Adult size
5 cm
Minimum tank size
54 liters
Lifespan
2–3 years
Social structure
Harem (one male, several females)
Group
at least 5, ideally 8+
Male–female ratio
1 erkek : 2 dişi
Swimming zone
Middle
Diet
Omnivore
Breeding
Livebearer

Water parameters

Temperature22–28°C
pH7–8
General hardness (GH)8–20 dGH
Recommended range
Considered shrimp safe Suitable for planted tanks

Overview

October 16, 2026 · Suggest an edit

The porthole livebearer is recognized by a row of round black spots running along the middle of its body; its English name comes from these spots resembling a ship's portholes. Males are around 3 cm, females up to 5 cm. The body is yellowish-olive and semi-transparent, and the fins are colorless. It is not a showy species, but its hardiness and calm nature earn it a place in livebearer enthusiasts' collections. The number and clarity of the spots vary from individual to individual; the spots show more clearly over a dark substrate and in a calm setting.

Tank Setup

October 16, 2026 · Suggest an edit
  • 54–60 liters for a small group.
  • 23–27°C, pH 7–8, moderate hardness.
  • Dense plants and floating plants; open swimming space in the middle.
  • 25% water change weekly.

Diet

October 16, 2026 · Suggest an edit

Omnivorous. Fine flakes and micro granules, spirulina food, frozen brine shrimp and daphnia. It also grazes on algae and biofilm.

Behavior and Compatibility

October 16, 2026 · Suggest an edit

Peaceful; males follow the females but do not wear them out. In a calm community aquarium it uses the middle zone. It shows its most natural behavior when kept as a small group with at least 2 females per male; since adults may eat the fry, dense planting reduces fry losses.

Good companions: platies, small rasboras and tetras, corydoras, otocinclus, shrimp.

Avoid: large and aggressive fish, fin-nipping barbs, large livebearers that grab food quickly.

A short profile for this species

The Porthole Livebearer page has the basics, but the sections below have not been written yet. If you keep this species, write a section from your own experience; it will be published under your name after editor approval.

Tank mates

This list is calculated automatically from the species profile and grows as new species are added to the catalog. Try it in the planner for a definite answer.

Usually compatible

Should not be kept together

Hobbyist notes

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Change history and contributors
  1. Page created · October 16, 2026