{"product_id":"ray-finned-fish-tropical-uk-teugelsi-bichir","title":"Teugelsi Bichir (Polypterus teugelsi) - UK","description":"\u003cp\u003eThe Teugelsi Bichir, \u003cem\u003ePolypterus teugelsi\u003c\/em\u003e, is one of the most unusual \u003cstrong\u003eRay-Finned Fish\u003c\/strong\u003e you can keep in a home aquarium. This dragon-like predator comes from the Cross River system in Cameroon and combines ancient looks with surprisingly adaptable aquarium behaviour. If you have ever asked \u003cstrong\u003ewhat are ray finned fish\u003c\/strong\u003e, or \u003cstrong\u003ewhat is a ray-finned fish\u003c\/strong\u003e, this species is a brilliant example: a primitive, air-gulping fish with heavy scales, separate dorsal finlets, and a powerful body built for prowling the bottom after dark. In the right setup, \u003cstrong\u003eteugelsi bichir size\u003c\/strong\u003e in captivity usually reaches around 35-40 cm, with a lifespan that can exceed 15 years. That makes it a serious long-term fish for committed keepers of \u003cstrong\u003etropical fish UK\u003c\/strong\u003e collections.\u003c\/p\u003e\u003cp\u003eThis is not a frantic swimmer or a delicate show fish. Instead, it is a calm but opportunistic hunter with a bold feeding response, a fascinating prehistoric profile, and a reputation as a standout \u003cstrong\u003efreshwater ray-finned fish\u003c\/strong\u003e. For aquarists researching \u003cstrong\u003ehow to care for teugelsi bichir\u003c\/strong\u003e, the key points are a secure lid, warm water, strong filtration, dim areas, and tank mates too large to swallow. See our detailed photos showing the dark reticulated pattern, black pectoral fins, and orange-toned underside that make this \u003cstrong\u003eaquarium bichir UK\u003c\/strong\u003e favourite so distinctive. For keepers wanting a rare, intelligent, large predatory fish with genuine character, the Teugelsi Bichir is a superb choice.\u003c\/p\u003e\n\n\u003cdiv class=\"info-box\"\u003e\n  \u003ch4\u003e🔹 Quick Facts\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eScientific Name:\u003c\/strong\u003e \u003cem\u003ePolypterus teugelsi\u003c\/em\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCare Level:\u003c\/strong\u003e Moderate\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMin Tank Size:\u003c\/strong\u003e 400 litres (about 88 gallons)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e 24-28°C (75-82°F)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003epH Range:\u003c\/strong\u003e 6.0-7.5\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLifespan:\u003c\/strong\u003e Up to 15 years\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTemperament:\u003c\/strong\u003e Semi-aggressive\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDiet:\u003c\/strong\u003e Carnivore\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"species-profile\"\u003e\n  \u003ch3\u003eClassification\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOrder:\u003c\/strong\u003e Polypteriformes\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFamily:\u003c\/strong\u003e Polypteridae\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGenus:\u003c\/strong\u003e \u003cem\u003ePolypterus\u003c\/em\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eFor anyone exploring \u003cstrong\u003eray finned fish taxonomy\u003c\/strong\u003e, \u003cem\u003ePolypterus teugelsi\u003c\/em\u003e belongs to an ancient lineage of bony fishes. So, \u003cstrong\u003ewhat class are ray finned fish in\u003c\/strong\u003e? They are in Actinopterygii, the class that includes the vast majority of modern fish species. That means \u003cstrong\u003ea ray finned fish is a type of\u003c\/strong\u003e bony fish, and yes, \u003cstrong\u003eare ray finned fish osteichthyes\u003c\/strong\u003e? Broadly, yes. However, \u003cstrong\u003eare ray finned fish chondrichthyes\u003c\/strong\u003e? No, because Chondrichthyes are cartilaginous fishes such as sharks and rays. The \u003cstrong\u003eray finned fish scientific name\u003c\/strong\u003e for the group is Actinopterygii, while the species name here is \u003cem\u003ePolypterus teugelsi\u003c\/em\u003e. If you are curious about \u003cstrong\u003eray finned fish genus\u003c\/strong\u003e, this fish sits in the genus \u003cem\u003ePolypterus\u003c\/em\u003e, one of the most iconic ancient fish genera in the hobby.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"origin\"\u003eWhere Do Teugelsi Bichir Come From? Natural Habitat Explained\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eteugelsi bichir habitat\u003c\/strong\u003e is centred on the Cross River drainage in Cameroon. In the wild, these fish are found in shady, slow-moving streams and marginal river habitats with overhanging vegetation, leaf litter, submerged roots, and soft-bottom areas. This helps answer a common question: \u003cstrong\u003ewhere do ray finned fish live\u003c\/strong\u003e? The answer varies enormously across the class, but this species specifically comes from warm tropical freshwater with seasonal changes in flow, depth, and oxygen levels.\u003c\/p\u003e\n\u003cp\u003eThe natural \u003cstrong\u003eray finned fish habitat\u003c\/strong\u003e of \u003cem\u003ePolypterus teugelsi\u003c\/em\u003e explains much of its aquarium behaviour. It is a nocturnal ambush hunter that spends daylight hours resting under wood, among roots, or in dim corners. At dusk it becomes more active, using smell and touch as much as sight. This is one reason many keepers are surprised by how calm it seems during the day and how assertive it becomes at feeding time.\u003c\/p\u003e\n\u003cp\u003eBecause bichirs belong to a very old branch of the actinopterygians, they are often used when people ask \u003cstrong\u003ewhat does ray finned fish mean\u003c\/strong\u003e or \u003cstrong\u003ewhat is a ray finned fish meaning\u003c\/strong\u003e. The name refers to fins supported by bony rays rather than fleshy lobes. That also leads to the common comparison of \u003cstrong\u003eray finned fish vs lobe finned fish\u003c\/strong\u003e. Bichirs are ray-finned, but they retain several primitive features, which is why they are often described as living fossils. If you have wondered \u003cstrong\u003ewhat did ray finned fish evolve from\u003c\/strong\u003e or \u003cstrong\u003ewhen did ray finned fish evolve\u003c\/strong\u003e, the group has roots deep in early vertebrate history, long before most familiar modern aquarium fish appeared.\u003c\/p\u003e\n\u003cp\u003eAnother common customer question is \u003cstrong\u003ewhy are ray finned fish so diverse\u003c\/strong\u003e. The short answer is evolutionary success: ray-finned fishes adapted to nearly every aquatic niche on Earth. The Teugelsi Bichir represents an ancient, specialised branch of that success story. It is not a fast open-water swimmer. Instead, it is built for creeping, lung-assisted survival in low-oxygen waters, and powerful short bursts when prey appears.\u003c\/p\u003e\n\u003cdiv class=\"tip-box\"\u003e\n  \u003ch4\u003e💡 Expert Tip\u003c\/h4\u003e\n  \u003cp\u003eMimicking the natural habitat of this species improves confidence and feeding response. Use shaded zones, bogwood, broad caves, and calm areas rather than a bright, bare tank. Fish kept in dim, structured surroundings usually show more natural \u003cstrong\u003eteugelsi bichir behaviour\u003c\/strong\u003e and settle faster after transport.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"tank-setup\"\u003eHow to Set Up the Perfect Tank for Teugelsi Bichir\u003c\/h2\u003e\n\u003cp\u003eIf you are researching \u003cstrong\u003eteugelsi bichir tank setup\u003c\/strong\u003e or \u003cstrong\u003eteugelsi bichir aquarium setup\u003c\/strong\u003e, start with floor space, security, and water stability. This species is a bottom-dwelling predator that needs room to turn, patrol, and rest under cover. The official \u003cstrong\u003eteugelsi bichir minimum tank size\u003c\/strong\u003e should be treated as 400 litres for a growing specimen, but a larger tank is strongly recommended for an adult. In practice, the best \u003cstrong\u003eteugelsi bichir tank size\u003c\/strong\u003e for long-term care is 500-680 litres with a large footprint, especially if you plan to keep it with other robust fish.\u003c\/p\u003e\n\n\u003ch3\u003eTank Size Requirements\u003c\/h3\u003e\n\u003cp\u003eFor a single adult, aim for at least 150 x 60 cm of base area. Bigger is better because this fish is long-bodied and muscular rather than tall. If you are wondering \u003cstrong\u003ehow many teugelsi bichir in a tank\u003c\/strong\u003e, the safest answer for most aquarists is one specimen unless the aquarium is very large and the keeper has bichir experience. A compatible pair can work, but crowding several bichirs into a modest aquarium often leads to stress, feeding competition, and water quality problems.\u003c\/p\u003e\n\n\u003ch3\u003eWater Parameters\u003c\/h3\u003e\n\u003cp\u003eThe ideal \u003cstrong\u003eteugelsi bichir temperature\u003c\/strong\u003e is 24-28°C, with 25-27°C being a comfortable everyday range. The recommended \u003cstrong\u003eteugelsi bichir water temperature\u003c\/strong\u003e should stay stable rather than swinging day to night. Good \u003cstrong\u003eteugelsi bichir water parameters\u003c\/strong\u003e are pH 6.0-7.5 and hardness around 5-15 dGH. For keepers checking \u003cstrong\u003eteugelsi bichir water hardness\u003c\/strong\u003e, mid-soft to moderately hard water is usually well tolerated as long as it is clean and consistent. These are the \u003cstrong\u003eteugelsi bichir ideal conditions\u003c\/strong\u003e for long-term health, appetite, and growth.\u003c\/p\u003e\n\n\u003cdiv class=\"spec-grid\"\u003e\n  \u003cdiv class=\"spec-card\"\u003e\n    \u003cdiv class=\"spec-value\"\u003e24-28°C\u003c\/div\u003e\n    \u003cdiv class=\"spec-label\"\u003eTemperature\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"spec-card\"\u003e\n    \u003cdiv class=\"spec-value\"\u003e6.0-7.5\u003c\/div\u003e\n    \u003cdiv class=\"spec-label\"\u003epH\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"spec-card\"\u003e\n    \u003cdiv class=\"spec-value\"\u003e5-15 dGH\u003c\/div\u003e\n    \u003cdiv class=\"spec-label\"\u003eHardness\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"spec-card\"\u003e\n    \u003cdiv class=\"spec-value\"\u003e400L+\u003c\/div\u003e\n    \u003cdiv class=\"spec-label\"\u003eMinimum Volume\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eFiltration\u003c\/h3\u003e\n\u003cp\u003eStrong biological filtration matters because this is a heavy-bodied carnivore. The \u003cstrong\u003eteugelsi bichir filtration needs\u003c\/strong\u003e are best met by a large external canister filter or a sump system with generous media capacity. Flow should be moderate, not blasting. Bichirs do not need torrent-like current, but they do need excellent oxygenation and low dissolved waste. Pairing a dependable heater with robust filtration is essential in any serious \u003cstrong\u003eray finned fish aquarium\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eUse a tight-fitting lid with no gaps around pipes or cables. Bichirs are famous escape artists and can push through surprisingly small openings. Because they can gulp atmospheric air, they frequently visit the surface. Leave a humid air gap under the lid, but never leave the tank uncovered.\u003c\/p\u003e\n\n\u003ch3\u003eSubstrate\u003c\/h3\u003e\n\u003cp\u003eFine sand or smooth rounded gravel works best. Sharp gravel can scrape the belly and lower fins as the fish glides across the bottom. A dark substrate also helps this species feel secure and shows off the contrast in the body pattern visible in our ray-finned-fish.webp product image.\u003c\/p\u003e\n\n\u003ch3\u003ePlants and Decor\u003c\/h3\u003e\n\u003cp\u003eA \u003cstrong\u003eteugelsi bichir in planted tank\u003c\/strong\u003e setup can work if the plants are hardy and attached to decor rather than rooted in delicate stems. Good choices include Java fern, Anubias, and floating plants that dim the light. Use large pieces of wood, inert rock, and broad caves. The goal is not a dense aquascape but a practical network of shaded retreats. If you enjoy other bichirs, compare this species with \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Delhezi - Barred Bichir\u003c\/a\u003e, \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Endlicherii\u003c\/a\u003e, and \u003ca href=\"\/products\/west-africa\"\u003ePolypterus Bichir Lapradei - Laprade'S Bichir\u003c\/a\u003e to judge how much floor space each body type needs.\u003c\/p\u003e\n\n\u003ch3\u003eLighting\u003c\/h3\u003e\n\u003cp\u003eKeep lighting subdued to moderate. Bright lighting can make this nocturnal species hide continuously. Eight to ten hours of light is enough, especially if floating cover is used. In mixed displays, dimmer morning and evening periods often bring out more natural movement.\u003c\/p\u003e\n\n\u003cdiv class=\"info-box\"\u003e\n  \u003ch4\u003eQuick Setup Checklist\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eChoose a tank of 400 litres minimum, larger for adults\u003c\/li\u003e\n    \u003cli\u003eFit a secure lid with all gaps sealed\u003c\/li\u003e\n    \u003cli\u003eMaintain 24-28°C with stable heating\u003c\/li\u003e\n    \u003cli\u003eUse pH 6.0-7.5 and hardness 5-15 dGH\u003c\/li\u003e\n    \u003cli\u003eAdd caves, wood, and shaded resting places\u003c\/li\u003e\n    \u003cli\u003eUse strong biological filtration and regular water changes\u003c\/li\u003e\n    \u003cli\u003eAvoid tiny tank mates and all ornamental shrimp\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tip-box\"\u003e\n  \u003ch4\u003e💡 Pro Tip\u003c\/h4\u003e\n  \u003cp\u003eAlways cycle the aquarium for 4-6 weeks before adding a bichir. A newly set-up predator tank can look clean while still lacking the bacterial capacity to process waste from a carnivorous fish. Stable nitrogen cycling is one of the biggest differences between short-term survival and long-term success in a \u003cstrong\u003efreshwater bichir UK\u003c\/strong\u003e setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"feeding\"\u003eWhat Do Teugelsi Bichir Eat? Complete Feeding Guide\u003c\/h2\u003e\n\u003cp\u003eThe Teugelsi Bichir is a true carnivore. If you are asking \u003cstrong\u003ewhat do ray finned fish eat\u003c\/strong\u003e, the answer depends on the species, but the \u003cstrong\u003eteugelsi bichir diet\u003c\/strong\u003e should focus on meaty foods. In nature it hunts worms, insect larvae, crustaceans, and small fish. In the aquarium, the best approach is a varied menu of sinking carnivore pellets, chopped prawns, earthworms, mussel, white fish fillet, and occasional frozen foods.\u003c\/p\u003e\n\u003cp\u003eA practical \u003cstrong\u003eteugelsi bichir feeding guide\u003c\/strong\u003e starts with feeding after lights dim, when the fish is naturally more active. Juveniles usually need feeding once daily. Adults often do well on four to six meals per week, depending on body condition and tank temperature. This answers the common search query \u003cstrong\u003ehow often ray finned fish eat\u003c\/strong\u003e or \u003cstrong\u003ehow often ray-finned fish eat\u003c\/strong\u003e: not all ray-finned fishes eat alike, but adult bichirs should not be stuffed every day.\u003c\/p\u003e\n\u003cp\u003eAnother common question is \u003cstrong\u003ewill ray finned fish eat shrimp\u003c\/strong\u003e or \u003cstrong\u003ewill ray-finned fish eat shrimp\u003c\/strong\u003e. In the case of Teugelsi Bichir, yes—small shrimp are food, not companions. Large prawns offered as chopped seafood can be a useful supplement, but live ornamental shrimp will disappear. Likewise, tiny fish are risky tank mates because anything that fits in the mouth may be swallowed.\u003c\/p\u003e\n\u003cp\u003eBecause this species can breathe atmospheric air, customers also ask \u003cstrong\u003ehow do ray finned fish breathe\u003c\/strong\u003e. Most ray-finned fishes rely on gills, and \u003cstrong\u003ea ray finned fish moves its operculum to do which of the following\u003c\/strong\u003e? It pumps water across the gills for gas exchange. Bichirs are unusual because they also gulp air and use lung-like organs, which helps them cope with lower dissolved oxygen than many other fish. That does not mean poor water quality is acceptable—it simply means they have an extra survival tool.\u003c\/p\u003e\n\n\u003ctable class=\"comparison-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eTime\u003c\/th\u003e\n\u003cth\u003eFood\u003c\/th\u003e\n\u003cth\u003eAmount\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEvening\u003c\/td\u003e\n\u003ctd\u003eSinking carnivore pellets\u003c\/td\u003e\n\u003ctd\u003eWhat is eaten in 2-3 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAlternate evenings\u003c\/td\u003e\n\u003ctd\u003eEarthworms, prawn, mussel, fish fillet\u003c\/td\u003e\n\u003ctd\u003e2-4 bite-size pieces for adult fish\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cdiv class=\"food-recommendation\"\u003e\n  \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Senegalus - Senegal Bichir -\u003c\/a\u003e\n  \u003cp\u003eIf you are planning a bichir collection, compare feeding response and size expectations with the classic Senegal Bichir, a useful benchmark for smaller predatory setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"food-recommendation\"\u003e\n  \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Senegalus «Albino» - Albino Senegal\u003c\/a\u003e\n  \u003cp\u003eAn eye-catching alternative for keepers who want bichir behaviour in a lighter-coloured display, though still with the same carnivorous instincts toward very small tank mates.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"warning-box\"\u003e\n  \u003ch4\u003e⚠️ Feeding Warning\u003c\/h4\u003e\n  \u003cp\u003eOverfeeding causes ammonia spikes, greasy surface film, and obesity. Avoid feeder fish from unreliable sources, as they often introduce parasites and offer poor nutrition. Large chunks of fatty meat from mammals should also be avoided because bichirs digest aquatic proteins more efficiently.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"appearance\"\u003eWhat Does Teugelsi Bichir Look Like? Colors, Patterns \u0026amp; Varieties\u003c\/h2\u003e\n\u003cp\u003eThis species is one of the most striking bichirs in the hobby. Adult \u003cstrong\u003eteugelsi bichir size\u003c\/strong\u003e in captivity is commonly around 40 cm, though wild fish may exceed that. The body is long and cylindrical, with a broad head, thick ganoid scales, and a series of separate dorsal finlets that create the classic dragon-back silhouette. If you are looking for a \u003cstrong\u003elarge predatory ray finned fish\u003c\/strong\u003e with real presence, few species match the Teugelsi.\u003c\/p\u003e\n\u003cp\u003eThe base colour is usually dark brown to charcoal with a net-like black pattern across the upper body. The pectoral fins are often very dark, almost black, while the underside can show orange or rusty tones. Our photos show the rich contrast and the erect dorsal finlets that distinguish this fish from some similar species. The \u003cstrong\u003eray finned fish tail\u003c\/strong\u003e is rounded and powerful, built for sudden lunges rather than constant cruising.\u003c\/p\u003e\n\u003cp\u003eFor customers asking about \u003cstrong\u003eray finned fish features\u003c\/strong\u003e, bichirs are especially interesting because they combine ray-supported fins with primitive traits not seen in most common aquarium fish. They are sometimes described as \u003cstrong\u003eray finned fish with spiny fins\u003c\/strong\u003e, though in bichirs the finlets are more accurately separate dorsal structures than the stiff spines seen in cichlids. If you have wondered \u003cstrong\u003ewould ray-finned fish be considered a\u003c\/strong\u003e modern bony fish, the answer is yes, though bichirs sit on a very ancient branch of that lineage.\u003c\/p\u003e\n\u003cp\u003eSexing is difficult when young. In discussions of \u003cstrong\u003eteugelsi bichir male vs female\u003c\/strong\u003e, mature males usually have a broader, thicker anal fin used during spawning, while females tend to be deeper-bodied when full of eggs. There are no established ornamental colour morphs like those seen in some other species. Good diet, dark décor, and low-stress conditions are the best ways to intensify natural colour.\u003c\/p\u003e\n\n\u003ch2 id=\"compatibility\"\u003eWhat Fish Can Live With Teugelsi Bichir? Compatibility Guide\u003c\/h2\u003e\n\u003cp\u003eThe Teugelsi Bichir is semi-aggressive, but not in the same way as a territorial cichlid. It is best described as an opportunistic predator. That means \u003cstrong\u003eteugelsi bichir with other fish\u003c\/strong\u003e can work very well, provided those fish are too large to swallow and calm enough not to harass it. If you are searching for \u003cstrong\u003eteugelsi bichir compatible fish\u003c\/strong\u003e or reliable \u003cstrong\u003eteugelsi bichir tank mates\u003c\/strong\u003e, think in terms of size, body depth, and temperament.\u003c\/p\u003e\n\u003cp\u003eGood companions include other large bichirs, robust catfish, sizeable gouramis, and peaceful but substantial characins. Suitable examples from our range include \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Delhezi - Barred Bichir\u003c\/a\u003e, \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Endlicherii\u003c\/a\u003e, \u003ca href=\"\/products\/west-africa\"\u003ePolypterus Bichir Lapradei - Laprade'S Bichir\u003c\/a\u003e, \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Senegalus - Senegal Bichir -\u003c\/a\u003e, \u003ca href=\"\/products\/tropical-fish-uk\"\u003eGold Giant Gourami\u003c\/a\u003e, and \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePiaractus Brachypomus - Red-Bellied Pacu -\u003c\/a\u003e in very large aquariums. If you enjoy unusual air-breathing fish, the \u003ca href=\"\/products\/west-african\"\u003eWest African Lungfish - Protopterus Annectens\u003c\/a\u003e is fascinating, but it requires specialist planning and should not be treated as a casual tank mate.\u003c\/p\u003e\n\u003cp\u003eMany hobbyists ask whether this is the \u003cstrong\u003ebest bichir for community tank\u003c\/strong\u003e life. Realistically, no bichir is ideal for a standard community tank with tetras, rasboras, shrimp, and fancy aquascaping fish. The Teugelsi is better suited to a predator or oddball setup. Compared with smaller species, it has a larger mouth and more imposing adult size, so community options are narrower.\u003c\/p\u003e\n\u003cp\u003eInvertebrates are a poor match. Snails may survive if large and hard-shelled, but shrimp are almost always eaten. This directly answers the search question \u003cstrong\u003eshall ray-finned fish eat\u003c\/strong\u003e small crustaceans: for this species, yes, if they are small enough and active at the wrong time of day.\u003c\/p\u003e\n\n\u003ctable class=\"comparison-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecies\u003c\/th\u003e\n\u003cth\u003eCompatible?\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Delhezi - Barred Bichir\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd\u003e✅ Yes\u003c\/td\u003e\n      \u003ctd\u003eWorks in a large tank with multiple hides and careful feeding\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003e\u003ca href=\"\/products\/tropical-fish-uk\"\u003eGold Giant Gourami\u003c\/a\u003e\u003c\/td\u003e\n      \u003ctd\u003e⚠️ Caution\u003c\/td\u003e\n      \u003ctd\u003ePossible in very spacious aquariums; monitor feeding competition\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSmall tetras, guppies, shrimp\u003c\/td\u003e\n      \u003ctd\u003e❌ Avoid\u003c\/td\u003e\n      \u003ctd\u003eLikely to be eaten, especially at night\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eFor a 500-700 litre setup, one Teugelsi with one or two similarly sized oddball fish can work well. In larger systems, mixed bichir groups are possible if each fish has room and all are fed properly. If you are comparing \u003cstrong\u003eteugelsi bichir vs ropefish\u003c\/strong\u003e, ropefish are slimmer and more vulnerable to being outcompeted at feeding time, so they are not always ideal companions.\u003c\/p\u003e\n\u003cp\u003eSome search terms such as \u003cstrong\u003ewhat time ray finned fish open\u003c\/strong\u003e, \u003cstrong\u003ewhat time ray-finned fish open today\u003c\/strong\u003e, \u003cstrong\u003ewhat time ray-finned fish close\u003c\/strong\u003e, and \u003cstrong\u003ewhat time ray finned fish close today\u003c\/strong\u003e clearly relate to shops rather than fish biology. For the fish itself, the more useful timing question is activity: this species tends to “open up” after lights dim, so evening is the best time to observe natural hunting behaviour.\u003c\/p\u003e\n\u003cdiv class=\"tip-box\"\u003e\n  \u003ch4\u003e💡 Compatibility Tip\u003c\/h4\u003e\n  \u003cp\u003eAlways quarantine new arrivals for 2-4 weeks before adding them to a bichir aquarium. Predatory fish are tough, but they are still vulnerable to parasites introduced by feeder fish, wild-caught tank mates, or stressed imports. Quarantine also helps you confirm that every fish can compete for food safely.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"breeding\"\u003eHow to Breed Teugelsi Bichir: Complete Breeding Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eTeugelsi bichir breeding\u003c\/strong\u003e is possible, but it is not an easy project for the average hobbyist. This is a difficult species to breed consistently because sexing is subtle, adults need space and conditioning, and spawning often follows seasonal cues. For those asking \u003cstrong\u003edo ray finned fish lay eggs\u003c\/strong\u003e, yes—bichirs are egg-layers. However, \u003cstrong\u003edo ray finned fish have amniotic eggs\u003c\/strong\u003e or \u003cstrong\u003edo ray finned fish lay eggs with shells\u003c\/strong\u003e? No. Fish eggs are not amniotic eggs, and bichir eggs do not have shells like reptile or bird eggs.\u003c\/p\u003e\n\u003cp\u003eWhen discussing \u003cstrong\u003eray finned fish reproduction\u003c\/strong\u003e, bichirs are seasonal egg scatterers. The female releases eggs while the male fertilises them, and there is no parental care. That means \u003cstrong\u003eray finned fish eggs\u003c\/strong\u003e should be protected from adults, which may eat them. If you are studying \u003cstrong\u003eteugelsi bichir male vs female\u003c\/strong\u003e, mature males usually show a thicker anal fin and more obvious breeding condition, while females become fuller in the abdomen when carrying eggs.\u003c\/p\u003e\n\n\u003ch3\u003eBreeding Setup\u003c\/h3\u003e\n\u003cp\u003eUse a spacious breeding tank with warm, clean water around 26-28°C, subdued light, and plenty of fine-leaved plants or spawning mops. Strong conditioning with worms, prawns, and quality carnivore foods is essential. Large water changes with slightly cooler water sometimes help mimic seasonal triggers.\u003c\/p\u003e\n\n\u003ch3\u003eSpawning Behaviour\u003c\/h3\u003e\n\u003cp\u003eDuring courtship, the male may nudge and follow the female closely. The pair may move through plants or mops while eggs are released in small batches. Hobbyists asking \u003cstrong\u003ehow often ray finned fish spawn\u003c\/strong\u003e or \u003cstrong\u003ehow often ray-finned fish spawn\u003c\/strong\u003e should know that this is not a weekly breeder. Spawning is occasional and usually linked to condition and environmental cues rather than a fixed schedule.\u003c\/p\u003e\n\n\u003ch3\u003eEgg Care and Hatching\u003c\/h3\u003e\n\u003cp\u003eRemove the eggs or adults after spawning. Gentle aeration and clean water are important. Fungus can be a problem if infertile eggs are left among fertile ones. Newly hatched bichirs are especially fascinating because juveniles show external gills, a reminder of how ancient this lineage is. This is one reason people ask \u003cstrong\u003ewhen did ray finned fish first appear\u003c\/strong\u003e or \u003cstrong\u003ewhat came before ray finned fish\u003c\/strong\u003e when discussing bichirs—they look like a living link to very early fish evolution.\u003c\/p\u003e\n\n\u003ch3\u003eFry Care\u003c\/h3\u003e\n\u003cp\u003eFry need tiny live foods at first, then larger frozen foods as they grow. Growth is steady but not instant. Excellent hygiene is critical because juvenile predators foul water quickly. Cannibalism can occur if sizes vary too much.\u003c\/p\u003e\n\n\u003cdiv class=\"tip-box\"\u003e\n  \u003ch4\u003eAdvanced Breeding Tip\u003c\/h4\u003e\n  \u003cp\u003eCondition a potential pair separately for several weeks on earthworms, chopped prawn, and high-quality pellets, then reunite them after a large water change and slight drop in conductivity. Experienced bichir keepers often find that environmental change, not just heavy feeding, is the trigger that starts courtship.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"comparison\"\u003eTeugelsi Bichir vs Similar Species: Which Should You Choose?\u003c\/h2\u003e\n\u003cp\u003eChoosing between bichir species matters because adult size, pattern, and temperament vary more than many buyers expect. If you are comparing \u003cstrong\u003ewhich ray finned fish is best\u003c\/strong\u003e or \u003cstrong\u003ewhich ray-finned fish is best\u003c\/strong\u003e for your aquarium, the right answer depends on tank size and your taste in oddball fish. The Teugelsi is best for keepers who want a rarer, darker, more dramatic bichir with a strong prehistoric look.\u003c\/p\u003e\n\n\u003ctable class=\"comparison-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eTeugelsi Bichir\u003c\/th\u003e\n\u003cth\u003eSenegal Bichir\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Size\u003c\/td\u003e\n\u003ctd\u003eUp to 40 cm captive\u003c\/td\u003e\n\u003ctd\u003eAbout 30-35 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCare Level\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature\u003c\/td\u003e\n\u003ctd\u003e24-28°C\u003c\/td\u003e\n\u003ctd\u003e24-28°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e£38.71\u003c\/td\u003e\n\u003ctd\u003eVaries by specimen\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest For\u003c\/td\u003e\n\u003ctd\u003eRare oddball predator displays\u003c\/td\u003e\n\u003ctd\u003eEntry-level bichir keeping\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ctable class=\"comparison-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eTeugelsi Bichir\u003c\/th\u003e\n\u003cth\u003eEndlicherii\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Shape\u003c\/td\u003e\n\u003ctd\u003eLong, elegant, patterned\u003c\/td\u003e\n\u003ctd\u003eHeavier, broader-headed\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAdult Space Needs\u003c\/td\u003e\n\u003ctd\u003eLarge\u003c\/td\u003e\n\u003ctd\u003eVery large\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperament\u003c\/td\u003e\n\u003ctd\u003eSemi-aggressive\u003c\/td\u003e\n\u003ctd\u003eMore imposing predator\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eVisual Appeal\u003c\/td\u003e\n\u003ctd\u003eDark reticulated markings\u003c\/td\u003e\n\u003ctd\u003eBold barred pattern\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBest For\u003c\/td\u003e\n\u003ctd\u003eCollectors of rarer bichirs\u003c\/td\u003e\n\u003ctd\u003eKeepers with huge predator tanks\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eIf you want a more accessible bichir, look at \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Senegalus - Senegal Bichir -\u003c\/a\u003e or \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Senegalus «Albino» - Albino Senegal\u003c\/a\u003e. If you want a stronger, bulkier predator, \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Endlicherii\u003c\/a\u003e may be the better match. If your goal is a rarer species with stunning dark patterning and a classic Cross River profile, Teugelsi is the standout.\u003c\/p\u003e\n\u003cp\u003eFor broader fishkeeping questions such as \u003cstrong\u003eray finned fish species\u003c\/strong\u003e, \u003cstrong\u003ewhich ray finned fish examples\u003c\/strong\u003e, \u003cstrong\u003eare gar ray finned fish\u003c\/strong\u003e, and \u003cstrong\u003eare goldfish ray finned fish\u003c\/strong\u003e, the answer is yes in both examples: gars and goldfish are ray-finned fishes, but they are very different branches of the group. That is why bichirs are so captivating—they show how varied the class Actinopterygii really is.\u003c\/p\u003e\n\n\u003ch2 id=\"health\"\u003eCommon Health Problems in Teugelsi Bichir \u0026amp; How to Prevent Them\u003c\/h2\u003e\n\u003cp\u003eA healthy Teugelsi Bichir has clear eyes, intact fins, smooth breathing, a full but not bloated body, and a strong feeding response. It should rest calmly by day and become more exploratory in low light. Because this species can gulp air, occasional trips to the surface are normal. Constant frantic surfacing, however, can indicate poor water quality or stress.\u003c\/p\u003e\n\u003cp\u003eCommon problems include skin abrasions from rough décor, bacterial infections after injury, internal parasites in newly imported fish, and digestive trouble from poor diet. White spot can affect bichirs, but treatment must be chosen carefully because scaleless-looking oddballs can be sensitive to overdosing. Always verify dosage and increase aeration during treatment.\u003c\/p\u003e\n\u003cp\u003eOne useful biology point for customers asking \u003cstrong\u003ea ray finned fish moves its operculum to do which of the following\u003c\/strong\u003e is that opercular movement supports gill ventilation. If a bichir is breathing heavily while also spending unusual time at the surface, check ammonia, nitrite, and temperature immediately. Even though bichirs can breathe air, they still suffer in polluted water.\u003c\/p\u003e\n\u003cp\u003ePrevention starts with stable \u003cstrong\u003eteugelsi bichir water parameters\u003c\/strong\u003e, a meaty but not excessive diet, and a secure, low-stress environment. Avoid mixing it with fin-nippers or tiny fish that trigger constant hunting behaviour. If you plan to \u003cstrong\u003ebuy teugelsi bichir UK\u003c\/strong\u003e stock for an established predator tank, quarantine is essential before introduction.\u003c\/p\u003e\n\u003cdiv class=\"warning-box\"\u003e\n  \u003ch4\u003e⚠️ Medication Warning\u003c\/h4\u003e\n  \u003cp\u003eNever guess medication doses with bichirs. Start with confirmed water tests, remove carbon from filters during treatment, and monitor oxygenation closely. If invertebrates are present elsewhere in a connected system, remember that copper-based medications are lethal to shrimp and many other non-fish animals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"info-box\"\u003e\n  \u003ch4\u003eQuarantine Protocol\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eUse a separate heated tank for 2-4 weeks\u003c\/li\u003e\n    \u003cli\u003eProvide pipe hides or caves to reduce stress\u003c\/li\u003e\n    \u003cli\u003eObserve feeding response daily\u003c\/li\u003e\n    \u003cli\u003eTest ammonia and nitrite frequently\u003c\/li\u003e\n    \u003cli\u003eWatch for flashing, excess mucus, or cloudy eyes\u003c\/li\u003e\n    \u003cli\u003eOnly move the fish once it is feeding confidently and symptom-free\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2 id=\"behavior\"\u003eHow Does Teugelsi Bichir Behave in the Aquarium?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eTeugelsi bichir behaviour\u003c\/strong\u003e is one of the main reasons people fall in love with the species. It is not hyperactive, but it is always interesting. By day it often rests under wood or beside rocks with just the head exposed. By evening it begins cruising the bottom, lifting itself with the pectoral fins and investigating every scent trail in the tank.\u003c\/p\u003e\n\u003cp\u003eThis fish is usually kept singly or as part of a carefully planned oddball collection. It is not a schooling species and does not need companions to feel secure. In a suitable setup, it becomes bold enough to recognise feeding routines and may even learn to take food from tongs. That makes it especially rewarding for aquarists who enjoy interactive predator fish rather than fast shoaling displays.\u003c\/p\u003e\n\u003cp\u003eBecause it is a nocturnal hunter, bright open tanks often make it seem shy. Add shade, broad shelters, and a calm routine, and you will see much more personality. This is also why a proper \u003cstrong\u003eteugelsi bichir care guide\u003c\/strong\u003e always emphasises structure over decoration for decoration’s sake.\u003c\/p\u003e\n\n\u003ch2 id=\"why-buy\"\u003eWhy Buy from Tropical Fish Co?\u003c\/h2\u003e\n\u003cp\u003eTeugelsi Bichir is still a relatively uncommon species in the hobby, so sourcing matters. When customers search \u003cstrong\u003eteugelsi bichir for sale UK\u003c\/strong\u003e, \u003cstrong\u003eteugelsi bichir online UK\u003c\/strong\u003e, or \u003cstrong\u003eorder teugelsi bichir UK\u003c\/strong\u003e, they are usually looking for healthy, feeding specimens rather than just the lowest \u003cstrong\u003eteugelsi bichir price UK\u003c\/strong\u003e. That is especially important with bichirs, because a settled fish that already accepts prepared foods is far easier to establish than a stressed specimen that only recognises live prey.\u003c\/p\u003e\n\u003cp\u003eOur approach focuses on condition and transition. Each Teugelsi Bichir is observed for feeding response, body condition, and normal air-gulping behaviour before sale. We look for clean fins, full bellies without swelling, and steady movement along the bottom. Fish are acclimated to stable tropical freshwater conditions suitable for UK homes, making the move into a mature aquarium smoother.\u003c\/p\u003e\n\u003cp\u003eFor \u003cstrong\u003eteugelsi bichir delivery UK\u003c\/strong\u003e, fish are packed in insulated boxes with professional bagging methods designed for large-bodied oddballs. Heat packs are used in cold weather when needed, and all livestock travel by tracked service. This matters with bichirs because temperature drops and rough packing can leave them stressed and reluctant to feed on arrival.\u003c\/p\u003e\n\u003cp\u003eIf you are comparing listings such as \u003cstrong\u003emay ray finned fish for sale\u003c\/strong\u003e, \u003cstrong\u003emay ray-finned fish for sale\u003c\/strong\u003e, \u003cstrong\u003emight ray finned fish for sale\u003c\/strong\u003e, or \u003cstrong\u003eshall ray finned fish for sale\u003c\/strong\u003e, the better question is not the phrasing of the advert but whether the seller understands the species. A fish from the ancient \u003cstrong\u003eray finned fish order\u003c\/strong\u003e Polypteriformes is not just another tropical fish. It needs secure packing, informed handling, and realistic care advice. We include practical guidance on acclimation, feeding, and lid security so you can start correctly from day one.\u003c\/p\u003e\n\u003cdiv class=\"care-highlight\"\u003e\n  \u003ch4\u003eWhy Choose Tropical Fish Co for Teugelsi Bichir\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003eCare advice tailored to a rare, air-breathing bichir rather than generic predator fish notes\u003c\/li\u003e\n    \u003cli\u003eFeeding and condition checks focused on getting specimens established on aquarium foods\u003c\/li\u003e\n    \u003cli\u003eInsulated, tracked livestock packing suitable for long-bodied oddball fish in UK transit\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003eOrder your Teugelsi Bichir today with confidence if you want a rare, intelligent predator that rewards proper care with years of fascinating behaviour.\u003c\/p\u003e\n\n\u003ch2 id=\"related-products\"\u003eYou Might Also Like\u003c\/h2\u003e\n\u003cp\u003eBuilding a bichir or oddball setup? Compare species and complete your stocking plan with \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Delhezi - Barred Bichir\u003c\/a\u003e for a beautifully patterned alternative, or \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Senegalus - Senegal Bichir -\u003c\/a\u003e if you want a more common entry point into bichir keeping. For larger predator displays, \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePolypterus Endlicherii\u003c\/a\u003e offers a heavier-bodied look, while \u003ca href=\"\/products\/west-africa\"\u003ePolypterus Bichir Lapradei - Laprade'S Bichir\u003c\/a\u003e suits keepers who enjoy classic West African oddballs.\u003c\/p\u003e\u003cp\u003eIf you want to explore other ancient air-breathing fish, the \u003ca href=\"\/products\/west-african\"\u003eWest African Lungfish - Protopterus Annectens\u003c\/a\u003e is a remarkable specialist species. For a robust display companion in a very large aquarium, consider the \u003ca href=\"\/products\/tropical-fish-uk\"\u003eGold Giant Gourami\u003c\/a\u003e or \u003ca href=\"\/products\/tropical-fish-uk\"\u003ePiaractus Brachypomus - Red-Bellied Pacu -\u003c\/a\u003e after checking size and compatibility carefully.\u003c\/p\u003e","brand":"Tropical Fish Co","offers":[{"title":"Default Title","offer_id":57379774628175,"sku":"K764","price":45.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/1408\/6735\/files\/polypterus-teugelsi-natural-aquarium-k764.webp?v=1777850320","url":"https:\/\/tropical-fish-co.myshopify.com\/products\/ray-finned-fish-tropical-uk-teugelsi-bichir","provider":"Tropical Fish Co","version":"1.0","type":"link"}