YoYo Loach (Botia lohachata)

Recognise the fish and its adult scale

The YoYo Loach, Botia lohachata, is a freshwater, bottom-dwelling member of the Botiidae family from rocky and gravel-bottomed streams in Pakistan, India, Nepal and Bangladesh. FishBase records a maximum of 15.4 cm total length, so plan for a substantial adult loach rather than treating a smaller dispatch fish as a permanent miniature.

This fish suits a keeper who can maintain a mature, filtered tropical aquarium, provide a proper social group and leave enough room for every member at adult size. It is an active community candidate rather than a solitary ornament or a substitute for routine aquarium maintenance.

Why it is called a YoYo Loach

Wikipedia describes three Y-shaped bands on Botia lohachata, positioned in front of, below and behind the dorsal fin, with a circular dot between the bands on the middle of the flank. These shapes led to the familiar YoYo name. Other established common names include Reticulate Loach, Pakistani Loach and Painted Loach.

Aquarium-trade use of the name has historically overlapped with the closely related Botia almorhae. This animal is identified as Botia lohachata, while the historical naming overlap explains why photographs and older articles may show differences in the exact arrangement of the dark pattern.

Choose the dispatch option without confusing it with adult size

One purchase supplies one animal of the option selected through the live size selector. The size labels are 3 - 4 cm, 5 - 6 cm and XL. The size you select is the size supplied, not the adult size. Use the FishBase maximum of 15.4 cm total length when planning the permanent aquarium, irrespective of the dispatch option chosen.

The numeric labels describe dispatch length ranges. XL is a named selector option, so base the long-term stocking decision on the adult maximum rather than interpreting XL as a final adult measurement. Check the live selector for the choices presented when ordering; static text cannot replace that live control.

Sex is guaranteed only when the selected option explicitly states male or female. This YoYo Loach listing has no sex-guaranteed option.

Understand the gallery before choosing

The gallery images are representative, based on reference photographs of this species, so colours can look slightly different from the live animal.

The illustrations show the characteristic black-and-cream pattern, forked tail and mouth barbels in several scenes. Use them to understand the overall form and markings, while allowing for normal visual differences between an illustration and a living fish.

Complete the offer checks

• Select the dispatch-size label that fits your plan.
• Count one animal for each purchase quantity.
• Build the social group into the aquarium plan before ordering.
• Review the delivery and Live Arrival Guarantee policy for the applicable process.
• Use the loaches and oddballs collection when comparing other identities and adult sizes.

Set the adult group, water and space plan first

OATA's loach care sheet gives 22–27°C, pH 6.5–8.0, 4–12°dH and a group of at least five for loaches; FishBase places Botia lohachata in 24–30°C, pH 6.0–8.0 and 5–12°dH environments. For routine aquarium planning, use the overlap of 24–27°C, pH 6.5–8.0 and 5–12°dH.

Keep at least five, with more being better when aquarium capacity permits. Build the aquarium around five adult fish of up to 15.4 cm each, plus every other planned occupant. A dispatch group may look small at first, but its permanent space, filtration and shelter must match the adult plan.

Do not borrow a small-loach volume blindly

OATA's 80-litre benchmark applies to a shoal of the smallest loach species. This species exceeds the sheet's general statement that most loaches stay below 10 cm, so use adult length, group size and the complete community to choose the aquarium. Prioritise enough usable bottom area for the group, several shelters, a filter that can support the final stocking level and stable water conditions.

For a stocking and compatibility assessment, contact us with the aquarium's dimensions, measured water values, filtration, established livestock and the number of loaches planned. Those details allow the whole system to be assessed rather than relying on litres alone.

Keep the water inside the shared routine range

Set the heater and maintenance routine around 24–27°C. This range is the overlap between the recorded species environment and OATA's aquarium guidance for loaches. Stability within that range is a better planning choice than using the warmer part of the environmental record as a routine target.

Use pH 6.5–8.0 and general hardness of 5–12°dH. OATA also gives carbonate hardness of 3–10°dKH for loaches. Test the aquarium and tap water rather than estimating these values from appearance or location.

Use measurements to make the decision

Start by recording the aquarium temperature, pH, general hardness, carbonate hardness, ammonia, nitrite and nitrate. Our water chemistry guide explains what the measurements represent. Enter the measured values into the water matcher to compare them with the target range.

If ammonia or nitrite is detectable, pause the introduction because both targets are zero. If temperature, pH or hardness falls outside the planned range, establish a stable suitable aquarium before adding the fish. Make changes through a controlled aquarium routine rather than chasing individual readings with abrupt adjustments.

Keep a useful weekly record

• Write down results rather than relying on memory.
• Compare each result with the previous week.
• Investigate a rising nitrate trend before it passes the stated limit.
• Retest after maintenance when a result is unexpected.
• Use fish behaviour alongside measurements, not in place of testing.

Build a bottom zone that protects skin and barbels

Use fine aquarium gravel or, ideally, sand across the main bottom area. OATA recommends these surfaces because loaches have sensitive skin and barbels that can be injured while they bury or search around the substrate. Inspect decorative material for coarse or damaging contact points before it enters the aquarium.

Provide shelter with live plants. Where live planting does not suit the aquarium, plastic plants and suitable ornaments such as plant pots or model caves can provide cover. Arrange several usable retreats so the group can occupy the bottom without every fish depending on one shelter.

Balance cover with usable space

Plan the layout at adult scale. A narrow opening that suits a 3 - 4 cm dispatch fish may not remain usable as it grows towards the recorded maximum of 15.4 cm. Choose structures with accessible entrances and place them securely on the aquarium base or substrate.

Check the proposed layout

• Picture five adult fish using the bottom at the same time.
• Confirm that shelters do not consume all usable floor area.
• Keep the substrate suitable wherever the fish can reach it.
• Check that every cave remains accessible at adult size.
• Leave the filter intakes and outlets clear of obstructing décor.

The aim is a structured aquarium with safe substrate, cover and enough room for the whole group. Decorative complexity only helps when each feature remains safe and usable as the loaches grow.

Mature the biological filter before stocking

A well set up and maintained filter is essential. The RSPCA explains that biological filtration supports beneficial bacteria which process toxic ammonia into nitrite and then into the safer end product nitrate. The aquarium must therefore be biologically prepared before the loaches are introduced.

Use our first tropical aquarium guide to prepare and mature the system. Confirm zero mg per litre ammonia and zero mg per litre nitrite with tests before adding fish; clear-looking water alone cannot demonstrate that the biological filter is ready.

Match filter capacity to the final plan

Calculate stocking around at least five loaches at up to 15.4 cm each, not around the initial dispatch lengths. Include every other fish in the same aquarium when judging the biological load. A filter that manages a lightly stocked juvenile aquarium must continue to support the community as the fish grow and feeding increases.

OATA advises increasing fish numbers slowly because the beneficial bacterial population must expand whenever more fish and food are added. Adding too many fish too quickly can leave the filter unable to process the extra waste, causing unhealthy ammonia or nitrite.

Keep the filter running as the central part of the aquarium's waste-processing system. Shelter, plants and clean-looking substrate complement filtration, but they do not replace a mature biological filter.

Introduce the group only when the aquarium is ready

Before adding the fish, test temperature, pH, hardness, ammonia, nitrite and nitrate. The decisive results are stable water within the planned range, zero mg per litre ammonia and zero mg per litre nitrite. Confirm that the filter is operating and that the adult group has appropriate substrate, shelter and usable bottom space.

Complete the pre-introduction check

1. Confirm a routine temperature of 24–27°C.
2. Check pH 6.5–8.0 and general hardness 5–12°dH.
3. Confirm ammonia and nitrite are both zero mg per litre.
4. Check that nitrate is not more than 20 mg per litre above the normal tap-water level.
5. Count the social plan: at least five loaches, with more only where aquarium capacity permits.
6. Inspect the substrate and shelters for safe adult access.

Increase the aquarium population slowly. Every added fish and every increase in feeding raises the waste load, while the filter bacteria need time to expand in response. A measured stocking sequence protects the biological stability already established.

Observe the fish after introduction

Watch swimming, colour, breathing, body condition, feeding response, fins, skin and eyes. Compare each fish with the rest of the group and with its own usual pattern. A change is more useful as a warning when it is noticed early and checked against measured water quality.

Observation complements testing. It should trigger a measured check rather than an assumption about the cause.

Feed an omnivorous sinking diet once a day

Loaches are omnivorous. Feed good-quality sinking pellets or granules as the routine aquarium food so the meal reaches the bottom where the fish can take it. Offer only the amount the group can eat within a few minutes, once a day.

Small live or frozen foods can add variety. OATA names daphnia, small bloodworm and tubifex as suitable examples for loaches. Use these as part of a controlled diet rather than increasing the total meal beyond what the fish finish promptly.

Use a simple feeding sequence

1. Choose a good-quality sinking pellet or granule.
2. Place a measured portion into the aquarium once that day.
3. Watch whether all five or more loaches gain access to food.
4. Stop adding food when the group has enough to finish within a few minutes.
5. Remove the cause of repeated leftovers by reducing the next portion.

Let water quality set the portion

Overfeeding leaves uneaten material to break down and release waste into the water. If food remains after a few minutes, reduce the next serving rather than adding another meal. Continue the weekly ammonia, nitrite and nitrate checks so feeding remains within the capacity of the biological filter.

Some loach species may eat aquarium snails, but the daily diet still needs a measured, nutritionally appropriate sinking food. Do not base routine feeding on the presence of snails or assume that any snail population will provide a controlled meal.

Complete a 25% partial water change at least once a week

Change 25% of the aquarium water at least once every week. A siphon can remove solid waste from the substrate during the change. Treat replacement tap water with a suitable conditioner to remove harmful chlorine or chloramine before it enters the aquarium.

Test ammonia and nitrite at least weekly and keep both at zero mg per litre. Check nitrate against the limit of not more than 20 mg per litre above the normal tap-water level. Record temperature, pH and hardness alongside these waste readings so changes can be recognised rather than guessed.

Protect the biological filter during cleaning

Check the filter for blockages. When the media needs cleaning, rinse it lightly in aquarium water removed during the partial change. Do not run it under the tap because chlorine or chloramine may kill part of the established beneficial bacterial population.

Respond to trends, not just single dates

A rising nitrate result, detectable ammonia or detectable nitrite shows that the aquarium routine and biological load need attention. Check feeding, stocking changes and filter operation together because each affects waste production or processing.

The larger the aquarium, the more stable environmental conditions such as temperature and water quality tend to be. That advantage still depends on regular testing, partial changes and filter care; aquarium volume does not replace maintenance.

Watch for changes in behaviour, breathing and condition

A healthy fish should have clear, bright eyes, undamaged fins, intact skin and appropriate swimming behaviour. Use daily observation to learn the group's normal activity and feeding response. Changes become easier to recognise when the aquarium routine and water results are also recorded.

Act on these warning signs

• Hanging at the surface, prolonged sitting on the bottom or erratic swimming.
• Turning darker or paler than the fish's usual colour.
• A change in temperament or substantially more hiding than usual.
• Gill covers moving faster or slower than usual.
• White spots, fluffy growths, damaged fins or skin changes.
• Increasing or decreasing body weight and condition.
• Reduced food intake or loss of interest in food.

If any of these changes appears, test temperature, ammonia, nitrite, nitrate, pH and hardness promptly. Correct husbandry decisions must begin with measured conditions rather than a guessed diagnosis. Contact us for further guidance when a health change continues or the fish's condition causes concern.

Handle and medicate with particular care

Loaches have a spine just beneath each eye and should be handled carefully. They also have reduced or absent scales and may be intolerant of some medications. Keep these physical traits in mind whenever the fish must be moved or a treatment is being considered.

Screen community fish by confidence, water and adult space

OATA describes many loaches as active, peaceful fish that can mix with most community fish, while warning that their activity may be too much for shy species. Begin with confident fish that share the 24–27°C routine range and can live within the same pH and hardness values.

Danios, larger tetras and barbs are OATA's examples of more confident companions for active loaches. Treat them as screening examples rather than automatic approvals: the exact species, adult size, group requirements, swimming space and total biological load still need to fit the aquarium.

Treat shy fish cautiously

A shy fish may be unsettled by the activity of loaches even when its temperature range matches. Confidence and behaviour therefore matter alongside chemistry. Assess the proposed companion's normal activity and shelter needs before including it in the stocking plan.

Make the decision for the whole aquarium

Individual communities can still differ, so every match is conditional. Check the exact companion species rather than relying only on a broad label such as tetra, barb or danio. Then calculate adult stocking, social groups, water overlap and filtration together.

Introduce livestock slowly after the biological filter is mature. Compatibility is not only whether fish attack one another; it also depends on whether the aquarium can meet every occupant's water, space and social needs at the same time.

Plan the loach group before adding other bottom dwellers

Keep at least five YoYo Loaches, with more being better where aquarium capacity permits. This is social guidance from OATA for loaches, so one fish is not the appropriate permanent plan. Count the group before allocating the remaining adult capacity to other livestock.

Use the recorded maximum of 15.4 cm total length for every member in the planning calculation. Five small dispatch fish represent five future adult fish; their first-day footprint should not determine the permanent stocking level.

Allocate resources to the full group

Make a cautious decision about snails

OATA notes that some loach species may eat aquarium snails and are sometimes used for pest control. Treat that as a possibility across the group rather than a guaranteed behaviour for this animal. A regular diet of sinking pellets or granules remains necessary.

If preserving ornamental snails is essential, keep them in another aquarium because the feeding outcome may place them at risk. Equally, choose this loach for its identity, adult size and social behaviour rather than expecting reliable removal of a pest-snail population.

Check the final stocking plan

• Start with at least five YoYo Loaches.
• Allow for up to 15.4 cm total length per loach.
• Choose confident companions with matching water requirements.
• Keep shy species under particular caution.
• Include every adult fish in the filtration and space calculation.
• Preserve valued snails separately if any loss would be unacceptable.

Answer the key questions before choosing

How big does a YoYo Loach get?

FishBase records a maximum adult length of 15.4 cm total length. Plan the permanent aquarium around that figure rather than the smaller dispatch size.

What size aquarium does a YoYo Loach need?

Plan a mature, filtered aquarium around at least five adults reaching up to 15.4 cm each, with usable bottom area, fine gravel or ideally sand, and several shelters. OATA's 80-litre benchmark is for shoals of the smallest loach species, so choose this aquarium around the full adult group and community.

How many YoYo Loaches should I keep together?

OATA's loach guidance advises at least five, with more being better where aquarium capacity permits. Calculate space and filtration for every fish at up to 15.4 cm total length.

Does a YoYo Loach suit beginners?

It suits a keeper who can provide a mature biological filter, zero mg per litre ammonia and nitrite, stable water and a group of at least five. It is not a suitable choice for an immature or unfiltered aquarium.

What does a YoYo Loach eat?

Feed good-quality sinking pellets or granules once a day, giving only what the group can finish within a few minutes. OATA also recommends small live or frozen foods such as daphnia, small bloodworm or tubifex for variety.

What temperature and pH does this fish need?

Use 24–27°C, pH 6.5–8.0 and 5–12°dH, the overlap between FishBase's species environment and OATA's loach aquarium guidance. Keep ammonia and nitrite at zero mg per litre.

Is it aggressive or likely to nip fins?

Plan around an active community fish rather than assuming aggression. OATA describes many loaches as active and peaceful but warns that their activity may be too much for shy species, so screen every companion for confidence, matching water and adult space.

Which fish can live with it?

OATA gives danios, larger tetras and barbs as examples of confident companions for active loaches. Every match remains conditional on compatible water values, adult size, social requirements, shelter and filter capacity; treat shy species cautiously.

How does it arrive alive in the UK?

Someone must be present to receive the parcel. Film every delivery continuously from the sealed parcel as it is opened, showing the fish still inside the sealed bag; float the bag for 20–30 minutes before releasing the fish, and never pour the bag water into the aquarium.

Read the identity and care references

• FishBase: Botia lohachata — identity, family, environmental values, distribution, conservation category and maximum recorded length.
• Wikipedia: Botia lohachata — natural habitat, geographic range, YoYo markings and historical aquarium-trade naming overlap.
• OATA: How to look after loaches — group aquarium guidance for water, social keeping, setup, feeding, maintenance, observation and community screening.
• RSPCA: Aquarium environment — biological filtration and aquarium waste processing.
• Tropical Fish Co: Delivery and Live Arrival Guarantee policy — delivery process and guarantee terms.