Guppy

Physical Characteristics

Highly variable appearance with significant sexual dimorphism. Males are usually smaller with elaborate, brightly colored ornamental fins and tails. They possess a gonopodium, a modified anal fin used for internal fertilization. Females are typically larger, rounder, and have more subdued, greyish-silver coloration with less dramatic finnage.

Habitat & Distribution

Found in various freshwater and brackish environments including streams, rivers, ponds, and marshes. They are native to South America and the Caribbean, specifically Venezuela, Guyana, Trinidad and Tobago, and Brazil, but have been introduced globally to control mosquito populations.

Size & Weight

Standard size ranges from 1.5 to 3.5 centimeters (0.6 to 1.4 inches) for males, while females are larger at 3 to 6 centimeters (1.2 to 2.4 inches). They weigh between 0.1 to 0.5 grams.

Similar Looking Species

Poecilia wingei (Endler's Livebearer), which is smaller and features more metallic, neon-colored patterns and a different tail structure; Gambusia holbrooki (Eastern Mosquitofish), which lacks the colorful ornamentation of male guppies.

Ecological Role

Functions as an opportunistic omnivore, consuming algae, plant fragments, small insects, and larvae. They serve as a vital food source for larger fish and birds. Their conservation status is 'Least Concern' as they are highly adaptable and prolific breeders.

Identified on: 2/18/2026

Mode: Standard