Bloody Mary Shrimp Care Guide - Setup, Feeding & Breeding

Bloody Mary Shrimp are a striking ornamental colour form of Neocaridina davidi, recognised for their rich, wine-red to crimson body colour. Unlike some red shrimp lines that show a translucent shell with visible internal organs, high-grade Bloody Marys can have a deep, opaque appearance extending across much of the body and legs.

These small freshwater invertebrates are peaceful, active grazers that spend much of their time walking over plants, wood, rocks and aquarium glass. They use their tiny appendages to collect algae, biofilm and edible particles, often becoming most active when the aquarium is dimly lit or quiet.

In nature, Neocaridina davidi inhabits shallow freshwater environments with plentiful surfaces for grazing and shelter. In aquariums, the shrimp’s behaviour is especially interesting in a group, as individuals constantly forage, moult and interact without displaying territorial aggression.

Colour intensity varies with genetics, age, sex and background. Selectively bred Bloody Mary Shrimp may produce offspring with a range of red shades, particularly when kept in a mixed Neocaridina colony. They are popular inhabitants of planted and nano aquariums because they combine vivid colour with a gentle temperament and a useful role as small-scale scavengers.

Bloody Mary Shrimp are a selectively bred red colour form of Neocaridina davidi, a species native to freshwater streams, ponds and slow-moving waters of Taiwan and parts of mainland China in Asia. The Bloody Mary colour line was developed in the aquarium trade rather than occurring as a distinct wild population.

A colony of Bloody Mary Shrimp can be housed in an established aquarium of at least 20 litres, with a footprint around 30 by 20 cm or larger; a longer tank is preferable to a tall one. Use a gentle sponge filter or protect the intake of a conventional filter with a fine pre-filter. Include live plants, moss, fine-leaved stems, driftwood, smooth stones and other textured surfaces for grazing and shelter, particularly for newly hatched shrimp. An inert sand or fine gravel substrate is suitable, and stable, mature conditions are more important than elaborate equipment.

Females reach a maximum of about 3 cm (1.2 inches), while males are usually smaller at around 2–2.5 cm (0.8–1 inch).

Bloody Mary Shrimp graze naturally on algae, biofilm, microorganisms and decomposing plant material. Supplement this grazing with a quality shrimp food containing minerals and plant matter, along with occasional blanched spinach, courgette, cucumber or leafy greens. Small amounts of sinking pellets, algae wafers and protein-rich foods can be offered periodically, but remove uneaten food promptly to protect water quality. A varied diet and access to calcium-rich foods support healthy moulting and shell development.

Bloody Mary Shrimp are best kept with peaceful, small tankmates such as nerite snails, ramshorn snails, Malaysian trumpet snails, otocinclus and other calm nano fish that are unlikely to hunt them. They can also live with other Neocaridina colour forms, although mixed colour lines may produce less predictable or duller offspring over time. Avoid bettas, dwarf cichlids, larger gouramis, aggressive barbs, loaches and most fish known to eat small invertebrates, as they may prey on adult shrimp or their young.

Bloody Mary Shrimp breed readily in mature freshwater aquariums when well fed and kept stable. Females carry a clutch of eggs beneath the abdomen for around three to four weeks, continually fanning them with their swimmerets. The eggs hatch as fully formed miniature shrimp, with no free-swimming larval stage. Provide dense moss, fine-leaved plants and other cover so young shrimp can graze safely, and avoid fish that may eat the babies.

Females are larger and more robust, with a broader, rounded abdomen and often stronger colouration. Males are slimmer, usually paler and have a straighter underside; mature females may also show an easily visible saddle or developing eggs beneath the shell.