Black Moscow Guppy Care Guide - Aquarium Tips, Diet & Breeding

Black Moscow Guppies are a striking domestic strain of Poecilia reticulata, recognised for their deep black coloration. The strongest colour is usually seen across the body and tail, although the exact shade and pattern can vary between individual fish and breeding lines.

Like other guppies, they are lively, alert and constantly active in the upper and middle levels of the aquarium. They are generally peaceful and display interesting social behaviour, with males frequently courting females and showing off their fins.

In the wild, guppies inhabit shallow streams, drainage channels, ponds and slow-moving margins of rivers. These environments often contain aquatic vegetation, leaf litter and fluctuating water conditions, and the species has become widely established outside its native range.

Black Moscow Guppies are cultivated aquarium fish rather than a naturally occurring wild colour form. Selective breeding has emphasised their dark pigmentation while retaining the hardy, adaptable character that has made guppies popular with aquarists for generations.

The Black Moscow Guppy is a selectively bred colour variety of the Common Guppy, Poecilia reticulata. The species originates from northern South America and nearby Caribbean islands, including Venezuela, Guyana, Suriname, French Guiana, Trinidad and Barbados.

A group of Black Moscow Guppies should have at least 40 litres, with a practical minimum footprint of about 60 × 30 cm; a larger aquarium is preferable for a mixed-sex colony or when raising fry. Use gentle filtration, open swimming space and dense planting around the edges, with floating plants providing cover. A fine gravel or sand substrate works well, while wood, smooth stones and live plants create a natural-looking layout without obstructing the upper swimming levels.

Males reach about 3.5 cm (1.4 in), while females can grow to approximately 6 cm (2.4 in), including the tail.

Offer a varied omnivorous diet based on quality tropical flakes or small pellets, supplemented with frozen or live foods such as baby brine shrimp, daphnia and mosquito larvae. Guppies also benefit from some vegetable matter, including spirulina-based foods or blanched vegetables. Feed small portions that they consume quickly, taking the fish's small mouths and active metabolism into account.

Black Moscow Guppies are peaceful community fish and can be housed with similarly sized, non-aggressive species such as platies, mollies, peaceful tetras, rasboras, white cloud mountain minnows and small Corydoras. Avoid fin-nipping species such as tiger barbs, as well as larger cichlids and predatory fish that may eat them. Long-finned males can be harassed by persistent nippers, and mixed-sex groups will produce fry regularly.

Black Moscow Guppies are prolific livebearers that breed readily in a mature aquarium. Males fertilise females internally, and a female typically gives birth to free-swimming fry after a gestation period of around 21–30 days. Provide dense fine-leaved plants or spawning mops where fry can hide, as adults may eat newborns. Females can store sperm and produce several broods from a single mating.

Females are noticeably larger and deeper-bodied than males, with a rounded abdomen and a dark gravid spot when carrying developing fry. Males are smaller and more slender, with a modified anal fin called a gonopodium and usually more pronounced finnage and colour.