How to Identify Black Molly

To identify Black Molly (Poecilia sphenops var. 'Black'), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Uniform, intense, velvety black over the entire body and fins. Some individuals may exhibit a slight metallic sheen under certain lighting. The eyes are typically dark.

Scale type

cycloid

Mouth position

superior

Distinctive features

Solid black pigmentation covering the entire body and fins., Livebearer (gives birth to live young)., Sexual dimorphism: Males are generally smaller, possess a modified anal fin called a gonopodium for reproduction, and may have more elaborate dorsal fins (especially in 'Sailfin' variants). Females are larger and rounder, particularly when gravid.

Dorsal fin

Single dorsal fin, typically rounded to somewhat elongated, depending on the specific strain (e.g., 'Sailfin' mollies have greatly enlarged dorsal fins).

Tail fin

Caudal fin is typically rounded or lyre-shaped in some cultivated varieties.

Pectoral fin

Paired pectoral fins, relatively small and clear to black.

Distinctive fins

Males possess a gonopodium, a modified, rod-like anal fin used for internal fertilization. Females have a fan-shaped anal fin.

Identification Tips

1. 1

   Coloration

   The most defining characteristic is the uniform, deep black color across the entire body and fins. Any other coloration or patterning would indicate a different Molly variant or species.

2. 2

   Body Shape

   Typical Molly body shape: somewhat compressed laterally, with a moderately deep body. Males are more slender, females are rounder.

3. 3

   Fin Structure (Males)

   Presence of a gonopodium (modified anal fin) in males is a key identifier for livebearers. The dorsal fin can vary in size depending on the specific 'Black Molly' strain (e.g., standard vs. sailfin).

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