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Ninja Shrimp

Caridina serratirostris

A captivating freshwater shrimp from the Indo-West Pacific, celebrated by aquarists for its remarkable and rapid color-changing camouflaging abilities.

Taxonomy
Class:Malacostraca
Order:Decapoda
Family:Atyidae
Genus:Caridina
Species:Caridina serratirostris

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Water Temperature

20 - 27 °C

pH Value

6.5 - 8

Water type

Freshwater

Invertebrate type

Freshwater shrimp

Adult size

3.5 cm

Minimum group

>= 6

GH

6 - 15 dGH

KH

2 - 8 dKH

TDS

110 - 305 ppm

Ecological role

Scavenger

Species description

Geographical Origin and Habitat: Widely distributed in the Indo-West Pacific region, ranging from Madagascar to Fiji and northern Australia. It inhabits coastal freshwater rivers, streams, and swamps with slow flow and dense vegetation.
Taxonomy: Historically classified as Caridina serratirostris. Recent taxonomic works (circa 2026) place it in the genus Marosina based on genetic and morphological uniqueness. Belongs to the family Atyidae, named for its serrated rostrum.
Social Behavior: Peaceful, active, and highly social. They should be kept in groups of at least 8 to 10 individuals to encourage active behavior. They spend their time grazing on bio-cover, organic detritus, and algae.
Coloration and Sexual Dimorphism: Famous for their ability to quickly change color from bright red to brown, black, blue, or cream, matching their substrate. Females are slightly larger and have deeper abdominal plates to carry eggs.

Care, breeding and tankmates

Tank Setup: A well-planted aquarium of at least 40 liters (approx. 10 gallons) is required. Include plenty of fine-leaved plants, mosses, and driftwood to provide grazing surface and hiding spaces. Use dark substrate to enhance their colors.
Diet and Feeding: Primarily herbivorous scavenger. Feeds on algae, biofilm, and decaying leaves. Supplement with high-quality shrimp pellets, spirulina powder, blanched spinach, and organic leaf litter like catappa leaves.
Water Quality: Keep temperatures between 22°C and 27°C (72-81°F), pH 6.5 to 8.0, and soft to medium hardness. Ensure a sponge pre-filter is installed on filter intakes to prevent shrimp from being sucked in. Water must be well-oxygenated.
Compatibility and Tankmates: Peaceful toward all tankmates. Best kept in a dedicated shrimp tank. If housed in community aquariums, choose small, non-aggressive species like micro-devario or small tetras. Avoid large or predatory fish.
Aquarium Breeding: Extremely challenging. While females spawn and carry numerous tiny eggs, the hatched larvae require brackish water stages to develop and metamorphose before transitioning back to freshwater, similar to Amano shrimp.
Risks and Diseases: Copper is highly toxic even in trace amounts. Susceptible to molting issues if water minerals are low. Avoid rapid water parameter fluctuations during water changes; drip acclimation is highly recommended.

Geographic Origin and Distribution

Widely distributed in the Indo-West Pacific region, ranging from Madagascar to Fiji and northern Australia. It inhabits coastal freshwater rivers, streams, and swamps with slow flow and dense vegetation.

Origin

Tropical oceans and reefsAfrica and MadagascarAustralia, New Guinea, and Oceania

Invertebrate profile

Diet
Omnivore
The diet of Caridina serratirostris typically consists of organic detritus, microalgae, or specific planktonic particles. In a home aquarium, they constantly forage along the substrate or rockwork looking for nourishment. Supplemental feeding with specialized invertebrate pellets or liquid foods may be necessary. Ensuring a varied and nutritious diet will promote vibrant colors and long-term health. Overfeeding should be avoided to maintain optimal water quality.
Ecological role
Scavenger
In the wild, Caridina serratirostris plays a crucial role in maintaining the balance of its native ecosystem. They often act as natural cleaners, breaking down waste materials and unconsumed food. Their constant movement helps aerate the sand bed and prevent the buildup of toxic gases. By managing algae growth, they create space for slow-growing corals and sponges to thrive. A balanced aquarium ecosystem relies heavily on their diligent cleaning efforts.
Shock sensitivity
High
This invertebrate is highly sensitive to rapid fluctuations in water parameters. Sudden changes in temperature, salinity, or pH can cause severe osmotic shock and death. A slow and careful acclimation process, preferably drip acclimation, is absolutely necessary. Maintain stable aquarium conditions through regular monitoring and automated top-offs. Avoid performing excessively large water changes at once.
Calcium and minerals
Medium
Proper calcium levels are absolutely vital for the structural integrity and growth of this species. They continuously extract calcium carbonate from the water to build their shells, skeletons, or protective tubes. Maintaining calcium levels between 400 and 450 ppm ensures they remain healthy. It is also important to balance alkalinity and magnesium alongside calcium supplementation. Regular testing is required in heavily stocked reef aquariums.
Molting
Regular
If applicable to its morphology, this invertebrate undergoes periodic molting to facilitate growth. During the molting process, the organism becomes extremely vulnerable to predation and stress. It is crucial to provide ample hiding spaces, such as caves or crevices, where they can retreat safely. Do not remove the discarded exoskeleton, as they often consume it to quickly replenish essential minerals. Disturbing them during this delicate phase can lead to fatal complications.
Reproduction
Oviparous
Reproduction in the home aquarium is often challenging and rare for many invertebrate species. Most require highly specific environmental triggers, such as temperature shifts or lunar cycles. The resulting larvae usually have a prolonged planktonic stage, making them difficult to rear. Specialized food sources like phytoplankton are needed to sustain the offspring. Consequently, most specimens available in the hobby are wild-caught or professionally aquacultured.
Compatibility & tankmates
Peaceful
Compatibility varies largely based on the specific species and tank mates. They are generally peaceful but can fall prey to aggressive or predatory fish. Ensure they are housed with calm tank mates that will not nip or harass them. Research individual species requirements to avoid territorial disputes. Always monitor new additions carefully to ensure harmonious interactions.

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

Related species

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Variants and close relatives

Same atlas type, nearby scientific identity, genus, or family.

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Last updated: 06/30/2026
Ninja Shrimp (Caridina serratirostris) Care Guide & Tank Setup | Atlarium