Red Cherry Shrimp

Behind the Name

The Red Cherry Shrimp is a selectively bred colour morph of Neocaridina davidi, originally a dull brown-grey shrimp native to Taiwan and southern China. The species was first described by Bouvier in 1904 as Neocaridina denticulata sinensis, later reclassified as N. davidi in honour of French zoologist Armand David, who collected extensively in China during the 1860s–70s. The genus name Neocaridina means ‘new Caridina’ — distinguishing it from the closely related Caridina genus. The ‘Cherry’ name appeared in the early 2000s when Taiwanese breeders isolated the red colour gene and selectively bred for deeper, more uniform red pigmentation. Today, the grading system runs from the palest Cherry (some transparent patches) through Sakura and Fire Red to the highest grade Painted Fire Red (completely opaque, deep red including legs and swimmerets).

Physical Features

Red Cherry Shrimp have the streamlined, compressed body plan typical of the family Atyidae. The body is divided into two main regions: the cephalothorax (head and thorax fused beneath a protective carapace) and the segmented abdomen, which curves beneath the body and terminates in a fan-shaped tail called the telson and uropods. Six pairs of appendages extend from the thorax: two pairs of small chelate claws (chelipeds) for gathering food and four pairs of walking legs (pereiopods). The underside of the abdomen bears five pairs of pleopods — feathery swimming limbs that females also use to fan and carry eggs.

Sexual dimorphism becomes apparent once shrimp reach maturity at around 60–75 days. Females are noticeably larger (2.8–3.5 cm versus 2.0–2.5 cm for males) and are distinguished by a solid, opaque red colouration that covers the full carapace and abdomen. The “saddle” — a patch of yellowish ovarian tissue visible through the carapace behind the head — is a reliable indicator of a maturing or reproductively active female. Males are smaller, more transparent, and typically show a less saturated, patchier red colouration; their slender abdomen lacks the broad, rounded profile of a gravid female.

The rostrum (a forward-projecting spine on the carapace) is modest in Neocaridina compared to some other shrimp families. Antennules and long antennae project from the head and serve as primary sensory organs, constantly sweeping surfaces for chemical signals. The compound eyes are set on short stalks and give near-360° vision — an essential adaptation for detecting predators in a species that has few other defences.

Water Chemistry Essentials

Red Cherry Shrimp are more sensitive to water chemistry than most aquarium fish, and sudden parameter shifts can trigger stress molts, reproductive failure, or death. The most critical rule is to never expose shrimp to copper in any form — copper is acutely lethal to all invertebrates, including at the trace concentrations found in many fish medications, algaecides, fertilisers, and even some tap water supplies. Always check the ingredient list of any product you add to a shrimp tank; if it contains copper sulfate or any copper compound, do not use it.

Beyond copper, shrimp are sensitive to ammonia and nitrite (ideally 0 ppm for both) and prefer nitrate below 20 ppm. Chlorine and chloramine in untreated tap water must be neutralised with a dechlorinator. pH swings are particularly dangerous — a drop or rise of 0.5 units or more in a short period can be fatal. Soft or acidic water below 6.5 pH is problematic because it impairs the ability to absorb calcium for shell construction, leading to failed molts.

Aquarium Setup Guide

A 20-litre nano tank is sufficient to establish a productive Red Cherry Shrimp colony, but a 40–60 litre setup provides greater stability in water parameters — an important factor given shrimp sensitivity. The foundation of a good shrimp tank is a mature, cycled nitrogen cycle: never add shrimp to an uncycled tank. Dark or natural-coloured fine substrates such as inert black sand or aqua soil not only enhance the red colouration through contrast but also support the growth of beneficial biofilm, the shrimp’s primary natural food.

Java moss, Christmas moss, and other fine-leafed mosses are practically mandatory in a shrimp tank. They provide dense foraging territory packed with microorganisms, refuge for juveniles, and grazing surfaces for biofilm. Floating plants like frogbit reduce light intensity and export nutrients through their roots. Leaf litter — Indian almond (Catappa) leaves in particular — breaks down slowly to release tannins and humic acids that buffer pH, provide additional biofilm, and create naturalistic shelter. Avoid sharp or jagged hardscape that could damage the delicate bodies of shrimp.

Nutrition & Diet

Red Cherry Shrimp are opportunistic omnivores that spend most of their waking hours grazing on biofilm — the thin layer of bacteria, microalgae, protozoa, and organic matter that colonises every surface in a mature aquarium. In a well-established planted tank with adequate lighting, biofilm alone can support a small colony without any supplemental feeding. However, as colony size grows and competition increases, targeted supplementation prevents malnutrition and supports optimal breeding.

Supplemental foods can be offered 3–4 times per week in small quantities that shrimp can consume within 2–3 hours. Blanched vegetables are excellent: zucchini (courgette), spinach, and cucumber all go down well. Commercial shrimp pellets and wafers provide concentrated nutrition; look for formulas with spirulina, kelp, and added calcium. Indian almond leaves and alder cones serve double duty as food substrate and water conditioner. Avoid overfeeding — uneaten food decomposes rapidly, spiking ammonia in what are usually small, lightly filtered tanks.

How They Reproduce

Egg Carrying

Red Cherry Shrimp are among the easiest freshwater invertebrates to breed in captivity, and a healthy colony in a stable tank will reproduce without any deliberate intervention. Breeding is triggered primarily by good water quality, adequate nutrition, and stable parameters — the shrimp do the rest. Females reach sexual maturity at approximately 60–75 days and develop a visible saddle (ovarian tissue) behind the head. During moulting, the female releases pheromones that trigger a frantic “mating swarm” in which males search the tank for the freshly moulted female. Fertilisation occurs quickly, and the female transfers eggs from her ovaries (saddle) to the pleopods (swimmerets) beneath her abdomen within hours of moulting.

A “berried” female — so named because the egg mass resembles a cluster of tiny berries — carries 20–30 eggs for approximately 25–35 days depending on temperature (faster at 24–26 °C). She continuously fans the eggs with her pleopods to oxygenate them and remove waste. Unlike most shrimp species, Neocaridina has no free-swimming larval stage: the eggs hatch directly into fully formed, 1–2 mm miniature adults that are immediately capable of foraging on biofilm.

Shrimplets are vulnerable for their first few weeks — they are readily eaten by fish and can be sucked into power filter intakes. Sponge filters and dense moss provide the best protection. Population growth can be rapid: a colony of 10 can expand to 50–100 within three months under ideal conditions.