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Caridina cantonensis, also marketed as Crystal Red Mosura Select (A), is a small freshwater shrimp valued for its strongly contrasting red-and-white pattern. This selectively bred form is especially suited to planted aquariums containing mosses, where it grazes on biofilm and microorganisms. Its small size and peaceful nature make it appropriate for colony keeping, provided that the water remains soft, stable, and well oxygenated. Water quality, a mature aquarium, and the absence of predators are the most important factors for supporting its health, longevity, and reproduction. The grade is common in the ornamental shrimp trade, although pattern quality varies between breeders.

General species description

Caridina cantonensis is a dwarf freshwater shrimp from the bee shrimp group, selectively bred for intense red-and-white markings. The term Mosura refers to a sought-after selective pattern, usually involving a large amount of white and clearly defined red areas. Select (A) is a commercial grade or sorting designation rather than a zoological category. The shrimp spends much of its time grazing on surfaces covered with biofilm, algae, and microorganisms. It is peaceful and does best in a group, especially in a species aquarium or a very calm community tank. Gentle filtration, copper-free water, and regular maintenance are essential. This form is very common in the aquarium trade, although the clearest grades may vary according to the breeder’s classification system.

Geographic origin and biotope

In the aquarium trade, this name refers to a selectively bred line distributed by Asian producers, with Indonesia being one of the reference countries for ornamental shrimp farming. It should not be read as the exact designation of a single wild population corresponding to the Crystal Red Mosura Select (A) grade. The aquarium environment generally imitates small, clear streams with moderate or cool temperatures, where shrimp graze on fine algae, periphyton, and decomposing plant material. Mosses, roots, and dried leaves provide feeding surfaces and shelter for juveniles. Stability is more important than chasing one isolated number: avoid rapid changes in temperature, pH, or conductivity. Soft, slightly acidic, stable, and well-oxygenated water is generally suitable for Crystal Red lines.

Precise locality and local name

The aquarium name used is Crystal Red, with the selective designation Mosura Select (A). International hobbyists also use Crystal Red Shrimp and CRS. Mosura is a breeder’s term describing a selected pattern, not a geographic locality. Consequently, the trade name cannot precisely connect every shrimp to a particular stream or wild population. Store labels may also differ according to the breeder’s grading system; the main criteria usually concern the amount of white, the clarity of the bands, and the intensity of the red. To avoid confusion, ask about the exact grade, rearing parameters, and source of the line. The most useful local or trade name to remember is therefore Crystal Red Mosura Select (A).

Appearance and physical characteristics

The body is small, elongated, and slightly laterally compressed, with long antennae and appendages adapted for grazing. In this selective form, the shell shows strong contrast between bright red areas and opaque white patches. Mosura patterns usually seek a dominant or highly developed white area interrupted by red markings, although the exact pattern varies between individuals. Color may fade after transport, during stress, or over a very pale substrate. Adult females are often larger and stockier, and may show an ovarian saddle or eggs beneath the abdomen when carrying. Juveniles resemble adults, but their markings are usually less sharply defined. Like other shrimp, they grow through moulting; shelters and stable water reduce risks after the exuvia is shed. Adult size generally remains below 3 cm.

General feeding

Caridina cantonensis mainly grazes on biofilm, microscopic algae, and organic particles deposited on leaves, roots, stones, and aquarium glass. In a mature tank, this natural food should form the foundation of the diet, but it may not be enough for a large colony. Offer small portions of sinking shrimp food once or a few times per week, depending on the amount of available biofilm. Catappa leaves and other suitable dried leaves can provide grazing surfaces and plant matter as they slowly decompose. Protein-rich foods may be offered occasionally to support growth, but excess food quickly pollutes a small aquarium. Remove uneaten food. A varied diet in small portions supports moulting and reproduction without compromising water quality. Products containing copper should be avoided completely because copper is toxic to shrimp.

Essential data

• River of origin:
• Local name used: Crystal Red Mosura Select (A)
• Origin of the scientific name: Caridina cantonensis combines the genus name Caridina with the specific epithet cantonensis.
• Full-name etymology: Caridina is a genus name associated with shrimp; cantonensis means “from Canton,” referring to the Canton region.
• Common or vernacular names: Crystal Red, Crystal Red Shrimp, CRS, Mosura Select (A)
• Family: Atyidae
• Subfamily: Atyinae
• Name pronunciation: ka-ri-di-na kan-ton-en-sis
• Discovery: S.-C. Yu, 1938
• Maximum adult size: About 3 cm
• Water temperature and pH: 20 to 24 °C; pH 5.8 to 6.8
• Stream appearance and surrounding vegetation: Small clear, well-oxygenated streams with mosses, leaves, roots, and periphyton.
• Typical tankmates: Caridina multidentata, Neritina natalensis, and other peaceful small freshwater snails.
• Temperament and behavior: Very peaceful and social; active on biofilm-covered surfaces, while juveniles seek shelter.
• Water depth: Shallow sections of small streams.
• Sexual dimorphism: Females are usually larger and stockier, with a visible ovarian saddle and a broader abdomen.
• Bottom structure and flow: Fine to gravelly substrate with plant debris and biofilm-covered surfaces; low to moderate flow.

In your aquarium

Success depends on a mature tank, gentle filtration, and copper-free water. Add mosses and shelters for juveniles, acclimate the shrimp slowly, and avoid predatory tankmates. Stable parameters are preferable to frequent corrections. Feed small amounts regularly, remove leftovers, and monitor water quality. A well-established colony can reproduce naturally when females carry eggs beneath the abdomen and have access to abundant grazing surfaces.