Lawu Snakehead (Channa cf. limbata 'Lawu')

Choose a Lawu snakehead for a covered species aquarium

The Lawu snakehead is a dwarf snakehead sold as Channa cf. limbata 'Lawu': a long, torpedo-shaped predator with a golden-brown body, rows of dark blotches along the flanks, and long dorsal and anal fins dotted with orange. Like every snakehead it breathes air at the surface, hunts by ambush and will eat any fish small enough to swallow. It is a fish for a covered aquarium of its own, kept by someone who enjoys watching one characterful predator rather than a busy community.

The scientific name needs a word of explanation. For many years the small snakeheads of South and Southeast Asia were all called Channa gachua. Seriously Fish describes that name as covering a complex of look-alike species in need of review, and FishBase still files limbata under C. gachua. A DNA barcoding study by Conte-Grand and colleagues (2017) found two widespread lineages, one west and one east of the Indo-Burma ranges, and suggested calling the eastern one Channa limbata, the oldest available name, until more detailed work splits it further. "cf." in the name means the fish compares with limbata but its exact identity has not been confirmed.

Know what the names mean

"Lawu" reads like a place name: Gunung Lawu is a volcano on the border of Central and East Java, and an Indonesian report in Jawa Pos describes Javan limbata living in mountain streams, springs and irrigation channels. We cannot independently confirm where this form was collected, so treat the name as a trade label. See all our snakeheads, the Channa snakeheads range, the wider other freshwater fish category and our loaches and oddball fish collection.

Check what you receive

One purchase supplies one live Lawu snakehead in the standard size we stock. It is sold as a young fish, not an adult, and its sex is not known or guaranteed: snakeheads are hard to sex, though Practical Fishkeeping notes that females are plumper.

The photographs show the pattern type, not the individual fish. Snakehead markings vary between individuals and change with age; Practical Fishkeeping notes that juveniles are often more brightly marked than adults, and a fish that has just travelled will look darker or paler than it does once settled. Expect the blotched pattern, not an exact copy of the picture.

Prepare before you order

• A tank with a tight lid, already running and cycled, with ammonia and nitrite at zero.
• Plenty of cover: wood, plants and a pipe or cave the fish can back into.
• A freezer of meaty foods, because this is a carnivore that should never be fed live fish.
• A plan for the adult size, so the young fish does not outgrow its first tank.

Read our delivery and Live Arrival Guarantee policy for dispatch days and arrival checks.

Check the law before you buy a snakehead

Snakeheads have a poor reputation in the news because some large species become invasive where they are released. In England and Wales, keeping non-native freshwater fish is controlled under the Import of Live Fish Act rules. The government publishes a checklist of freshwater fish that can be kept for ornamental purposes (version 7, last updated 13 October 2026), linked from the gov.uk page on keeping non-native fish. It lists the genus Channa with one exception: Channa argus, the northern snakehead, and its subspecies. A limbata-type snakehead is therefore covered by the general licence, and you do not need an individual licence to keep it.

That general licence has a firm limit: it covers indoor aquaria only. It does not allow a snakehead in a garden pond or an outdoor tank, and releasing any aquarium fish into the wild is illegal. Rules differ elsewhere in the UK. In 2017 OATA reported that all Channa species are restricted in Scotland and need a licence to keep, so if you live in Scotland or Northern Ireland, check your own government's current rules before you order.

Plan the tank for a 20 cm predator

Size figures for this group vary because the name has covered several fish. Seriously Fish gives a maximum of 200 mm standard length for C. gachua in the broad sense. Ecology Asia, describing C. limbata in Singapore, gives adults of about 20 cm total length. The Jawa Pos report on Javan limbata gives 16 to 20 cm. FishBase records a maximum of 32.9 cm total length for the complex as a whole. Plan for a fish of about 20 cm, and accept that a few individuals may grow larger.

Seriously Fish recommends a base of 120 x 45 cm, about 243 litres, for this group, with water at least 30 cm deep. Snakeheads are not fast swimmers; they need floor space to patrol and hide, not height. A long, wide tank with a tight lid suits them far better than a tall column.

Use a three-step space check

Our tank volume calculator converts your measurements into litres. Leave the tank mates question until you have read the compatibility section: for this fish, the size of the tank and the size of the other fish both matter.

Build dim cover and a tight lid

Seriously Fish recommends dim lighting and plenty of cover for this group: live plants, driftwood, terracotta pipes and plant pots, with floating plants such as Indian fern (Ceratopteris) over part of the surface. With overhead shade a snakehead hides less and spends more time in view. Practical Fishkeeping adds driftwood, plants and plenty of floating cover, and suggests gravel rather than very fine sand, because fine particles can clog filters.

The lid is not optional. Practical Fishkeeping calls a tight-fitting cover vital because snakeheads leap well, and Seriously Fish describes Channa as known escape artists. At the same time, these are obligate air breathers: Seriously Fish explains that paired chambers behind the gills, lined with breathing tissue, let them take air from the surface, and Practical Fishkeeping warns that a snakehead denied the surface can drown. Fill the tank to leave a few centimetres of warm, humid air under the lid.

Divide the tank by purpose

Keep the water clean, moderate and steady

The published ranges for this group are broad, which suits a fish found from hill streams to rivers and ditches. Choose the overlap and keep it steady.

Practical Fishkeeping notes that northern Indian populations of the gachua group need a cold winter, while tropical populations do not. We have no published water data for the Lawu form itself. If it does come from mountain water, as the name suggests, it may appreciate the cooler half of the range, so avoid running the tank hot and use our guide to tank temperature to set the heater.

Match your tap water first

UK tap water ranges from soft to very hard depending on where you live. Most dechlorinated tap water falls inside the broad Seriously Fish range, so the priority is not a perfect number but a steady one. Our water chemistry guide explains what pH and hardness mean, and the water matcher compares your readings with this fish's needs.

Filter strongly and change water gradually

A predator eating meaty food makes a lot of waste. For a 243-litre tank Seriously Fish suggests a filter turning the water over four to five times an hour, about 970 to 1,215 litres an hour, and a heater of roughly 150 to 250 watts in a room near 20°C. Spread the outflow so the surface stays fairly calm, because the fish needs to reach it to breathe. Our guide to aquarium filtration explains how to choose one.

How you change water matters as much as how often. OATA's care sheet for aggressive fish, which covers snakeheads, asks for a 25% partial change at least weekly, while Practical Fishkeeping warns that many snakeheads do poorly with large or rapid water changes. The two fit together: change a modest amount every week and keep the new water close to the tank's temperature and hardness.

Follow a weekly routine

1. Test ammonia, nitrite, nitrate, pH and hardness before you start.
2. Siphon waste and leftover food from the gravel.
3. Replace about 25% of the water with dechlorinated, temperature-matched tap water.
4. Rinse filter media lightly in removed tank water, never under the tap.
5. Check the lid and every gap around pipes and cables before you walk away.

Feed a predator without live fish

In the wild, FishBase records this group feeding at night on small fish, insects and crustaceans, and Ecology Asia lists insects and smaller fish. In the aquarium it will learn to take dead foods. Seriously Fish suggests bloodworm, small earthworms and chopped prawn for young fish, then fish strips, whole prawns, mussels and larger earthworms as it grows, with dried foods accepted but not used as the staple. Practical Fishkeeping adds sinking pellets and notes that live food is not essential.

Two rules matter. OATA says live fish must not be used as food, and Seriously Fish warns against feeder fish because of disease risk and poor nutrition. Seriously Fish also advises against mammal and bird meat, such as beef heart or chicken, because snakeheads cannot use those fats well. OATA asks you to feed aggressive species no more than once a day.

Build one measured meal

• Main foods: thawed small frozen krill, frozen mysis and pieces of frozen mussel meat.
• Treat food: a few earthworms, chopped for a young fish.
• Dry back-up: a sinking carnivore food such as Tropical Carnivore, once the fish recognises it as food.
• Portion: what the fish takes in a few minutes, once a day at most; remove leftovers.

Offer food in the evening if the fish hides by day, and use tongs: a hungry snakehead strikes fast.

Introduce it slowly and settle it in

Move a snakehead gently from bag to tank. OATA's method is to switch off the lights, float the sealed bag for 10 minutes, add tank water to the bag over up to 20 minutes and then net the fish across with as little bag water as possible; for fish shipped in boxes it describes slow drip acclimatisation through airline tubing. The Jawa Pos report on Javan limbata names temperature adjustment as the main hurdle for newly moved fish, and links poor adjustment to white spot and velvet.

A new snakehead usually hides for several days; that is normal. Our guide to acclimatising new fish covers the steps in more detail.

Decide between a species tank and careful company

This is where the sources disagree most, so here is what each says. OATA's care sheet for aggressive fish says snakeheads are aggressive towards any other fish and should be kept alone. Practical Fishkeeping describes the dwarf snakehead as docile and suitable for community tanks with fish too large to eat, and notes that smaller snakehead species are retiring and can suffer around large, aggressive cichlids. Seriously Fish says a species tank is usually best, but a community of peaceful, non-territorial fish too large to be eaten is possible. Juveniles can live together, though they often become aggressive as they mature, and an established pair is usually peaceful together but hostile to other snakeheads.

Ask three questions about any companion

1. Is it too big to swallow, now and when the snakehead is adult?
2. Is it calm? Boisterous or bullying fish stress a retiring predator.
3. Can you separate them quickly? Keep a spare tank ready.

Our tank mates tool can check a planned mix, but for this fish the safest answer is usually a tank of its own. Compare it with our other dwarf snakeheads, such as the Assam Dwarf Snakehead, the Chinese Snakehead, the Rainbow Snakehead and the Peacock Snakehead.

Handle it safely and watch its health

OATA's guidance for predatory fish is practical: some species have sharp teeth, so net them carefully, double-bag them for transport, never start a siphon by mouth, and wash your hands or wear long rubber gloves when working in the tank. A healthy snakehead has clear eyes, intact fins and skin, steady breathing and a strong feeding response; OATA lists clamped fins, flicking against objects and shimmying as warning signs.

Know what to expect if they breed

The gachua group are mouthbrooders. FishBase states that the male carries the eggs and fry in his mouth, and Seriously Fish adds that in some populations the female lays extra, infertile eggs that feed the fry once they swim free. Practical Fishkeeping says that a pair is best formed by letting several young fish choose partners in a large tank with plenty of hiding places, and that both parents guard the fry, which swim in a tight school. Seriously Fish warns against mixing populations, because some may hybridise: keep a Lawu pair with its own form, not with other limbata-type snakeheads.

Answer Lawu snakehead buying questions

What is a Lawu snakehead?

A dwarf snakehead sold as Channa cf. limbata 'Lawu'. The 'cf.' means it resembles Channa limbata but its exact identity has not been confirmed. Limbata is the name researchers suggest for the eastern populations of the Channa gachua species complex, and Lawu is a trade name for this dark, blotched form.

Is it legal to keep a Lawu snakehead in the UK?

In England and Wales, yes, in an indoor aquarium. The government checklist of fish covered by the indoor-aquarium general licence (13 October 2026) lists every Channa except Channa argus and its subspecies. It may not go in a pond or be released. In 2017 OATA reported that all Channa need a licence in Scotland, so customers in Scotland and Northern Ireland should check their own rules first.

How big does a Lawu snakehead grow?

Plan for about 20 cm. Seriously Fish gives 200 mm standard length for the gachua complex, Javan reports give 16 to 20 cm, and FishBase records a maximum of 32.9 cm total length for the complex as a whole, so some fish may grow larger.

What size tank does it need?

Seriously Fish recommends a base of 120 x 45 cm, about 243 litres, with water at least 30 cm deep. Fit a tight lid with an air gap above the water, because snakeheads jump and must breathe air.

Will a Lawu snakehead eat my other fish?

Yes, if they fit in its mouth, and it will also take shrimp. OATA says snakeheads are aggressive to other fish and should be kept alone; Practical Fishkeeping says dwarf snakeheads can live with fish too large to eat. A species tank is the safe choice.

What should I feed it?

Meaty foods: thawed krill, mysis, prawn and mussel, earthworms and sinking carnivore pellets. OATA says live fish must not be used as food, and Seriously Fish advises against beef heart, chicken and other mammal or bird meat.

Does it need a heater?

Yes, in a UK home. Aim for a steady 22 to 26 degrees C, inside the ranges given by Seriously Fish (18-28 degrees C) and FishBase (22-26 degrees C), and change the temperature slowly; sudden swings are a known cause of disease in newly moved fish.

Can I keep two Lawu snakeheads together?

Young fish can live together but often turn aggressive as they mature, and a bonded pair is usually hostile to other snakeheads. Start with one fish unless you have room and a second tank to separate them.

Consult the care references

• Seriously Fish: Channa gachua (including the name limbata): the Channa gachua complex, including the name limbata: size, aquarium footprint, water range, cover and lid, diet, behaviour, sexing and mouthbrooding.
• FishBase: Channa gachua: Channa gachua (limbata is filed here): maximum length, water values, habitat in hill streams and rivers, night feeding and male mouthbrooding.
• Conte-Grand et al. 2017, PLoS ONE: Barcoding snakeheads (Teleostei, Channidae) revisited: DNA barcoding of snakeheads: the eastern lineage of the gachua complex, for which the authors suggest the name Channa limbata.
• Practical Fishkeeping: Quick guide to snakeheads: snakehead care in general: air breathing, tight covers, cover and floating plants, foods, water changes, tank mates and pairing.
• OATA: How to look after aggressive fish: UK care sheet for aggressive and predatory fish, including snakeheads: water tests, maintenance, feeding, live-food ban, tank mates, acclimatisation and handling.
• Ecology Asia: Dwarf snakehead (Channa limbata): the dwarf snakehead Channa limbata in Singapore swamp forest: habitat, adult size, diet and name history.
• Jawa Pos, 14 Nov 2021: Channa limbata in Indonesian fishkeeping (in Indonesian): Channa limbata in the Indonesian hobby: Javan names, mountain-stream habitat, size and the importance of gradual temperature change.
• GOV.UK: Introduce or keep non-native fish and shellfish: UK government guidance on keeping non-native fish, with the indoor-aquarium list.
• GOV.UK checklist: Freshwater fish that can be kept for ornamental purposes (V7, 13 Oct 2026): the government checklist of freshwater fish that may be kept in indoor aquaria under the general licence in England and Wales (V7, 13 October 2026): Channa is listed, except Channa argus.
• OATA: Channa in the spotlight (July 2017): OATA, July 2017: Channa argus banned from sale in England and Wales, and all Channa restricted in Scotland.
• Tropical Fish Co delivery policy: current dispatch days and Live Arrival Guarantee terms.