Caridina japonica snow white

Identify the shrimp behind the trade name

Caridina japonica snow white is an atyid freshwater shrimp identified with the Amano shrimp. The words “snow white” distinguish this catalogue form, while the underlying identity determines the care decisions. It belongs to the family Atyidae and should be planned for as an Amano shrimp rather than treated as a separate species with different water, space or feeding needs.

The World Register of Marine Species now lists it as Caridina multidentata. Caridina japonica remains the familiar name carried by this item and is treated as a synonym of that accepted name.

Wikipedia’s species summary places this shrimp in Japan and Taiwan. It also lists Amano shrimp, Yamato shrimp, Japanese shrimp and algae shrimp among its common names. Those names identify the same animal and share one care plan.

Decide whether it suits your aquarium

This shrimp helps graze aquarium algae, while feeding, filtration, testing and water changes remain essential. Its value as a grazer depends on the same stable conditions required for its welfare.

The gallery images are representative of this type of animal rather than photographs of the exact animal supplied, so colours can look slightly different from the live animal.

Choose the dispatch size and plan for about 5 cm

One purchase quantity supplies one animal of the option you select. Use the live size selector to choose between the 2–3 cm and 3–4 cm dispatch grades, then set the quantity according to the group you have planned. The size you select is the size supplied, not the adult size.

A dispatch grade describes body size at dispatch. It does not identify sex, life stage or eventual adult dimensions. Selecting the smaller grade therefore does not justify a smaller permanent aquarium, and selecting the larger grade does not guarantee a particular age or sex.

Use one adult plan for both size options

OATA’s freshwater shrimp and snail guidance gives 17–27°C, pH 6.5–8.0, general hardness of 4–18°dH and carbonate hardness of 3–15°dKH for the group. It places ammonia and nitrite at 0 mg/L and nitrate at no more than 20 mg/L above the normal tap-water level. Treat these as broad planning values rather than a species-specific optimum, and keep the chosen conditions steady.

Sex is guaranteed only when the selected option explicitly states male or female. This Caridina japonica snow white listing has no sex-guaranteed option.

Check the current delivery and Live Arrival Guarantee policy when planning receipt of live livestock. The live selector remains the place to check the size choice for an order.

Check whether this animal suits the aquarium

Build enough space for a social shrimp group

Plan the aquarium around a group rather than treating one shrimp as the complete stocking plan. OATA describes shrimp species as usually social, while its aquarium-size advice uses a group as the basis for the minimum. Each purchase quantity remains one animal, so set the order quantity deliberately and keep the total within the capacity of the mature filter.

Approximately 20 litres is the starting point OATA gives for larger shrimp such as Amano shrimp. It is a planning floor for a shrimp setup, not a target for filling every part of the aquarium with livestock. A larger aquarium gives greater stability in temperature and water quality, and the aquarium must be larger when fish are included.

Choose the setup by its actual use

Every aquarium needs gravel or sand and suitable shelter. Live plants are ideal because they provide cover, while plastic plants and suitable ornaments such as plant pots or model caves can be used where live planting is not part of the design. Cover supports normal use of the aquarium but does not make a predator safe.

Choose the aquarium before deciding the final shrimp quantity. Starting with the desired number and trying to fit it into the smallest possible volume reverses the welfare decision. Space, filtration, water stability and compatibility should all be settled first.

You can browse the freshwater shrimp and crustaceans collection when comparing animal sizes and planning a shrimp-focused aquarium, but assess every animal against its own care needs before combining it with this group.

Mature the filter before introducing shrimp

A working filter is essential, and it must be biologically mature before the shrimp enter the aquarium. Maturity means the beneficial bacterial population can process the waste created by the livestock and their food; it is not achieved simply because the equipment has been running for a particular number of days.

The RSPCA’s aquarium filter explanation describes the biological sequence: toxic ammonia is converted to toxic nitrite and then to the safer nitrate. OATA applies the practical limit needed here by requiring ammonia and nitrite to remain at 0 mg/L.

Use readings rather than a calendar

Increasing livestock or feeding raises the amount of waste that the filter must process. Adding too much too quickly can leave too few nitrifying bacteria for the new load, producing the ammonia and nitrite rise commonly called new tank syndrome. Gradual stocking gives the bacterial population time to increase.

Do not use clear-looking water as a substitute for tests. Ammonia and nitrite are dissolved hazards, and their absence cannot be judged from appearance alone. Record the readings so a change is visible before it develops into a larger welfare problem.

Use our shrimp-keeping setup guide to prepare and mature the aquarium before arranging livestock. The aquarium is ready when its filter and measured water quality meet the required conditions, not merely when the aquascape looks complete.

Hold the water within the planning range

Keep temperature between 17 and 27°C, pH between 6.5 and 8.0, general hardness between 4 and 18°dH, and carbonate hardness between 3 and 15°dKH. Test ammonia and nitrite at 0 mg/L. Keep nitrate no more than 20 mg/L above the normal level in the tap water used for the aquarium.

The nitrate limit is relative to the starting water rather than a universal tank reading. If the conditioned tap water measures 10 mg/L nitrate, the aquarium should not exceed 30 mg/L. If the tap reading is 25 mg/L, the corresponding ceiling is 45 mg/L. Repeat the tap-water test when its baseline may have changed instead of relying indefinitely on an old result.

Turn every reading into a decision

Use the same units each time so results can be compared directly. Our water-chemistry guide explains which values to measure and why. Once you have current readings, the water matcher can help compare them with the planning range on this page.

Treat replacement tap water with a suitable conditioner before it enters the aquarium so harmful chlorine or chloramine is removed. A weekly record of the tap baseline and aquarium results makes gradual movement easier to see and gives context if activity, appearance or feeding changes.

A larger aquarium generally changes more slowly than a smaller one, but volume does not remove the need for tests. Stability comes from suitable volume, mature filtration, controlled stocking, measured feeding and a consistent maintenance routine working together.

Provide cover and invertebrate-safe conditions

Use aquarium gravel or sand and provide shelter throughout the setup. Live plants are the preferred form of cover in OATA’s aquarium guidance. Where live plants are not used, add plastic plants and suitable ornaments such as plant pots or model caves so the shrimp still have sheltered areas.

Arrange the aquarium before livestock enter it. A completed layout avoids unnecessary disturbance after introduction and lets you confirm that shelter remains accessible rather than being blocked by equipment or other ornaments.

Check the physical setup

• Substrate: use aquarium gravel or sand rather than leaving the permanent setup without the recommended base.
• Planting: include live plants where they suit the aquarium plan.
• Alternative cover: use plastic plants and suitable ornaments when live planting is not used.
• Filter: keep it operating continuously and check that it is not blocked.
• Grazing: expect the shrimp to feed on aquarium algae, while still providing supplementary food.

Freshwater shrimp are invertebrates and are highly sensitive to copper. They will die if exposed even to low levels, so check every aquarium treatment before use and apply only products explicitly identified as safe for invertebrates. Do not assume that a treatment suitable for fish is automatically suitable for shrimp.

The same check applies whenever a health concern occurs: establish whether the product is safe for invertebrates before anything enters the aquarium. Treatment names, dose changes and combinations should never be improvised from a general fish routine.

Cover supports the shrimp’s use of the aquarium, but it is not a substitute for compatible stocking. A fish able to swallow the shrimp remains unsuitable even in a heavily planted setup. Make the predator and mouth-size decision separately from the décor decision.

Feed a measured supplement two or three times a week

Freshwater shrimp generally graze algae in the aquarium, but grazing should be supplemented so the group receives deliberate, observable feeding. Use algae wafers or commercial pellets made for freshwater shrimp. Vegetables, general sinking fish foods and mineral supplements are not part of this feeding plan.

Feed two or three times a week. Leave pellets or wafers for at least 30 minutes so the shrimp have time to feed, then remove clear excess before it breaks down. Uneaten food adds waste, and excessive feeding can drive the ammonia and nitrite problems that a mature filter and weekly testing are intended to prevent.

Use a repeatable weekly pattern

Choose either two or three feeds according to how the group responds, then keep the pattern consistent enough to judge changes. If food repeatedly remains after the feeding period, reduce the next portion. Adding more animals or increasing the ration also increases the load placed on the biological filter.

Algae grazing is useful, but the shrimp should not be treated as a substitute for cleaning or water changes. Likewise, an aquarium containing visible algae does not remove the need for supplementary food. The measured feeding session lets you confirm that the animals approach food and maintain their normal interest in it.

Watch the group during each feed. Reduced intake or loss of interest in food is one of OATA’s warning signs, especially when it appears alongside inactivity, unusual hiding, a colour change or altered breathing effort. Respond by checking the aquarium rather than trying to correct the change with a larger portion.

Introduce livestock only after the aquarium passes its checks

Prepare the permanent aquarium before introducing the shrimp. Confirm that its volume suits the planned group, the filter is mature and working, cover is in place, and every measured water value sits within the stated range. Ammonia and nitrite must each read 0 mg/L.

Increase the number of shrimp and other animals slowly. Every addition increases waste and often increases feeding, so the beneficial bacteria in the filter must adjust to the new load. A large addition made before that adjustment can produce unhealthy ammonia and nitrite.

Use this introduction sequence

1. Measure temperature, pH, general hardness, carbonate hardness, ammonia, nitrite and nitrate.
2. Compare the readings with 17–27°C, pH 6.5–8.0, GH 4–18°dH and KH 3–15°dKH.
3. Confirm ammonia and nitrite are both 0 mg/L and calculate the nitrate ceiling from the tap-water baseline.
4. Complete the compatibility screen for every fish already in the aquarium.
5. Introduce livestock gradually, then continue testing before increasing the number again.

Do not treat the dispatch size as permission to skip any step. A 2–3 cm shrimp needs the same mature filter and safe tank-mate decision as a 3–4 cm shrimp. Both sizes contribute to the biological load once they and their supplementary food enter the aquarium.

After introduction, observe activity, hiding, colour and feeding against the animal’s normal pattern. Continue the weekly test routine and make an additional check whenever behaviour or appetite changes. If ammonia or nitrite appears, pause further additions and examine the filter and stocking load immediately.

The aim is not to reach a planned number as quickly as possible. It is to build the social group at a pace the aquarium can support while keeping toxic nitrogen compounds at zero.

Keep the weekly routine consistent

At least once every week, change 25% of the aquarium water. A siphon can remove solid waste from the gravel during the change. Treat all replacement tap water with conditioner before adding it so chlorine or chloramine does not harm the aquarium or the beneficial bacteria.

Test at least weekly, using the same set of readings and units. Ammonia and nitrite must remain at 0 mg/L, while nitrate must stay no more than 20 mg/L above the current tap-water baseline. Record results alongside feeding and maintenance so a change can be connected with recent stocking or increased food.

Complete one joined-up maintenance check

If the filter needs cleaning, rinse its media lightly in aquarium water removed during the partial change. Do not rinse it under the tap, because chlorine or chloramine may kill beneficial bacteria and reduce the filter’s ability to process waste.

Watch for increased inactivity, restlessness, unusual behaviour, darker or paler colour, increased hiding, altered breathing effort, white spots, discolouration, lesions, abnormal growths, exoskeleton damage, missing appendages, swelling, weight change or reduced feeding. One observation is more useful when paired with current water readings.

If the shrimp looks unwell or a change persists, send us the readings and a clear description promptly. Do not add a general fish treatment while investigating, because the shrimp’s copper sensitivity makes invertebrate safety an essential first check.

A stable routine gives each observation context. Weekly maintenance is not a response reserved for visible dirt; it protects water quality before dissolved waste becomes an obvious problem.

Screen every fish by mouth size and predatory behaviour

A community label is not enough to decide compatibility. OATA’s rule is direct: freshwater shrimp should not be mixed with fish that can fit them in their mouth or with species known to be predatory. Apply both parts of that screen before adding this shrimp to any fish aquarium.

Compare the shrimp with the actual fish rather than relying on the aquarium’s general description. A fish fails the screen if it can swallow the shrimp. A species also fails if it is known to prey on shrimp, even when its mouth size looks less obvious.

Use a conditional compatibility screen

Do not rely on planting or caves to turn a failed combination into a safe one. Cover remains important for shelter, but it cannot remove a fish’s ability to swallow the shrimp or change established predatory behaviour.

Recheck the decision when the size relationship changes. Compatibility depends on whether the fish can fit the shrimp in its mouth, so a conclusion based on one size pairing should not be treated as permanent without reassessment.

For a stocking assessment, send us the exact fish names, their sizes, the aquarium volume and the number of shrimp planned. When either mouth size or predatory behaviour remains unclear, keep the animals separate rather than testing the combination with live shrimp.

Choose between a shrimp-only and mixed setup

A shrimp-focused aquarium and a mixed aquarium start from different space and compatibility decisions. The shrimp-focused plan begins at approximately 20 litres for Amano shrimp, with a mature filter, gravel or sand, cover and stable water. A mixed aquarium must be larger and must also pass the fish screen.

Compare the two plans

Do not use a list of familiar community fish as a permanent approval. The decisive questions are whether the individual fish can fit the shrimp in its mouth and whether its species is predatory. This conditional approach also accounts for differences in fish size that a universal list would miss.

When fish are included, the larger aquarium still needs the same water limits: 17–27°C, pH 6.5–8.0, GH 4–18°dH, KH 3–15°dKH, ammonia and nitrite at 0 mg/L, and nitrate no more than 20 mg/L above tap water. Passing compatibility does not override any care value.

Plan the social shrimp group and the total biological load together. Every animal and every extra feeding increases the work required from the filter. Additions should stop whenever ammonia or nitrite rises, regardless of how much physical room appears to remain.

A shrimp-only aquarium removes the fish-predation decision, but it does not remove the need for filtration, cover, measured feeding, weekly testing or water changes. Choose it because it fits the intended stocking plan, not because it is maintenance-free.

Answer the key buyer questions

What is Caridina japonica snow white?

It is an atyid freshwater shrimp also known through the Amano shrimp common name, native to Japan and Taiwan.

How many Caridina japonica snow white shrimp does one purchase supply?

One purchase quantity supplies one animal of the selected option; increase the quantity deliberately when planning a social shrimp group.

Which size options can I select for Caridina japonica snow white?

The live selector shows 2–3 cm and 3–4 cm dispatch sizes. The size you choose is not an adult-size promise; plan for about 5 cm.

What aquarium setup does it need?

Use a mature, filtered aquarium with gravel or sand and cover from live plants, plastic plants or suitable ornaments. OATA uses approximately 20 litres for Amano shrimp and says a mixed aquarium must be larger.

Should Caridina japonica snow white be kept alone?

OATA describes shrimp species as usually social, so plan a group and add numbers gradually enough for the biological filter to adjust.

What water values suit this shrimp?

OATA’s freshwater shrimp and snail group guidance gives 17–27°C, pH 6.5–8.0, GH 4–18°dH and KH 3–15°dKH, with ammonia and nitrite at 0 mg/L and nitrate no more than 20 mg/L above tap water.

What does Caridina japonica snow white eat?

Let it graze aquarium algae and supplement with algae wafers or commercial freshwater-shrimp pellets two or three times a week, leaving the food for at least 30 minutes.

How should it be acclimated?

Introduce it only after confirming the aquarium is within the stated range and ammonia and nitrite are 0 mg/L; increase livestock numbers slowly rather than making a large addition at once.

Which tank mates suit it?

Screen every fish by mouth size and predatory behaviour. Avoid fish that can fit the shrimp in their mouth and species known to be predatory; use a larger aquarium when fish are included.

Reference the care and identity authorities

• World Register of Marine Species: accepted taxonomy, synonym status and family placement.
• Wikipedia species summary: native distribution and established common names.
• Ornamental Aquatic Trade Association: freshwater shrimp and snail husbandry, water ranges, aquarium planning, feeding, maintenance, health observations and compatibility.
• RSPCA aquarium welfare guidance: biological filtration and the conversion of ammonia through nitrite to nitrate.
• Tropical Fish Co delivery and Live Arrival Guarantee policy: current delivery, dispatch and guarantee terms.