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FishbeginnerFreshwater

Amazon Molly

Poecilia formosa

AnimaliaChordataActinopterygiiPoeciliidae

📍 Texas & Northeast Mexico

Ask Finn

The only known all-female vertebrate species, reproducing by gynogenesis using sperm from other mollies as a trigger without genetic contribution. A true biological oddity.

Size2.5"
Min Tank10g
School3+
peaceful
Zonemid

Care Guide

Diet

Amazon Mollies are omnivores that require a varied diet of high-quality flake foods, small pellets, and regular vegetable matter such as blanched spinach or algae wafers. Supplement 2-3 times weekly with frozen foods like brine shrimp or daphnia. Feed small amounts once daily, only what they can consume in 2-3 minutes.

Behavior

Amazon Mollies are peaceful, active swimmers that prefer to stay in mid-water zones and are most comfortable in groups of at least 3 individuals. They are livebearers that produce live young and may exhibit mild aggression toward males of other molly species, though they remain generally docile with non-competing fish. They are relatively hardy and adaptable to various water conditions.

Breeding

Breeding in captivity is straightforward and occurs readily in established tanks without special conditioning. Females are ovoviviparous and produce 10-40 fry every 4-6 weeks; provide dense vegetation or breeding box to protect young from predation. This species reproduces through gynogenesis, making them an unusual all-female population that requires males of related molly species to trigger reproduction.

Common Diseases

Fin Rot

Symptoms

Frayed, disintegrating fins; white or black edges on fins; lethargy

Treatment

Perform 25% water changes every 2-3 days, improve water quality, treat with aquarium salt (1 tsp per gallon) or antibacterial medication if severe

Ich (Ichthyophthirius multifiliis)

Symptoms

White spots on body and fins, rapid breathing, rubbing against objects, loss of appetite

Treatment

Raise temperature gradually to 28-30°C, treat with ich medication or aquarium salt; perform daily 25% water changes and maintain good filtration

Velvet Disease (Oodinium)

Symptoms

Fine golden or rust-colored dust on body, clamped fins, rapid breathing, lethargy

Treatment

Increase aeration, treat with copper-based medication or aquarium salt; dim lights as the parasite is light-sensitive; perform frequent water changes

Constipation

Symptoms

Bloated appearance, lack of feces, reduced activity, loss of appetite

Treatment

Feed blanched vegetables and high-fiber foods; perform 25% water change; fast fish for 1-2 days if severe; ensure varied diet to prevent recurrence

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Quick Facts

pH
7.0–8.5
diet
omnivore/herbivore
maxSize
3 inches
minTankSize
20 gallons
temperature
68–82°F (20–28°C)

Temperature

68–82°F

20–28°C

Stats

Community tips0
Kept by0 hobbyists