Somalia Nothobranch (Nothobranchius patrizii) - Killifish
£7.99
Rare Nothobranchius guentheri “Zanzibar” killifish for sale UK, an East African annual species prized for its jewel-like male colour and fascinating seasonal life cycle. Moderate care for keepers ready for a species-focused tank.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Nothobranchius guentheri
Gunther's Nothobranch bond and breed in male/female pairs. Buying a pair gives them the social structure they need — and you get a better price per fish.
Rare Nothobranchius guentheri “Zanzibar” killifish for sale UK, an East African annual species prized for its jewel-like male colour and fascinating seasonal life cycle. Moderate care for keepers ready for a species-focused tank.
Adult size is the maximum length this species reaches at full maturity (scientific sources). The livestock you receive will be younger and smaller — pick a size variant above for the actual shipping size. Photos are AI-enhanced, so the animal may show subtle colour or marking differences.
Maintain these water conditions for optimal health and vibrant colors
If you are searching for killifish for sale UK aquarists can genuinely enjoy and breed, Nothobranchius guentheri “Zanzibar” is one of the most rewarding choices in the hobby. This East African annual species is famous for its jewel-like male colour, fast maturity, and fascinating life cycle. Often listed among rare aquarium fish for sale uk and sought by keepers of rare aquarium fish uk, it offers something different from common community fish: intense patterning, bold feeding behaviour, and a true seasonal breeding strategy. Adults reach around 5 cm, males are far more colourful than females, and their natural lifespan is short at roughly 1 year, which makes every stage of their care feel special. In the aquarium, they are best described as moderate-care, semi-aggressive, and ideal for aquarists who want a species-focused setup rather than a busy mixed tank.
For hobbyists asking what is a killifish, this is a small egg-laying tropical fish adapted to temporary pools, not a livebearer. The Zanzibar form is manageable with the right setup, though not as simple as guppies. It is a standout among freshwater killifish UK listings and a favourite with people who want colourful killifish species in a compact aquarium. Our product photos show body pattern, fin shape, and the clear male-to-female differences. If you want to buy killifish UK fish that are unusual, active, and genuinely conversation-starting, this species delivers a vivid display in a small footprint.
Nothobranchius guentheri belongs to a group of African annual killifish known for inhabiting seasonal pools that dry out for part of the year. In the aquarium hobby, this genus is especially valued by breeders interested in egg diapause, short generation times, and intense adult colour. Compared with panchax and surface-dwelling species, Nothobranchius are more bottom-to-midwater oriented and have very different breeding needs.
The natural killifish habitat of Nothobranchius guentheri is very different from the flowing rivers many aquarists imagine. This species comes from coastal Tanzania, including Zanzibar, where it lives in temporary rain-fed pools, shallow floodplains, and seasonal depressions. These waters appear during wet periods and may disappear entirely in the dry season. That is why it is classed as a true annual killifish: its eggs survive the dry period buried in the substrate.
In the wild, these fish live over soft mud, leaf litter, and fine sediment, often in warm, still water with changing chemistry. Natural foods include insect larvae, tiny crustaceans, and other meaty prey, which is why their captive diet should be strongly protein-based. Aquarists building a killifish biotope aquarium can recreate this with a darker substrate, subdued lighting, sparse open swimming space, and selected cover plants. Note that despite occasional online listings, this is not a pond or river fish: it is a tropical annual species that must be kept indoors in a heated aquarium, never outdoors.
Because of its life cycle and colour, it is often grouped with oddball tropical fish and rare killifish for collectors. It is also a strong answer for aquarists browsing rare fish UK who want something genuinely different from standard tetras or barbs.
Mimicking the natural habitat improves colour, confidence, and breeding behaviour. A dark substrate, gentle flow, floating cover, and a quiet tank often bring out richer male reds and blues than a bright, bare aquarium.
Good killifish aquarium requirements start with understanding that this is a short-lived, active, carnivorous annual species. The basic killifish requirements are stable water, secure cover, low to moderate flow, and a layout that reduces male conflict. A 40-litre tank is the practical minimum, but a larger footprint gives better results, especially for a breeding group. A full group of five males and five females is too intense for a 40-litre aquarium; ten fish should only go in a substantially larger species tank with multiple sight breaks. For most home aquariums, 1 male with 2-3 females is the safer ratio.
The right tank size depends on aggression control as much as water volume. For a trio, 40-60 litres works well. For multiple males, 75 litres and up with dense visual barriers is much safer. This species can suit a killifish for small aquarium setup, but only if stocking is conservative and the tank is tightly covered — they can jump.
Accurate killifish temperature requirements matter. Aim for 22-26°C, with 23-25°C being a particularly steady working range for everyday care, and avoid sudden swings. Ideal water parameters are pH 6.0-7.5 and hardness 5-15 dGH, so moderate killifish water hardness is acceptable, though extreme hard water is not ideal. Most keepers target a near-neutral pH of roughly 6.8-7.2 for the best colour, feeding, and breeding response.
Use gentle but efficient filtration. A sponge filter is excellent for breeding tanks because it protects fry and keeps flow soft. In display tanks, a small internal filter or air-driven sponge unit works well. Strong current can stress the fish and spoil feeding response. Pair the setup with a reliable aquarium heater sized for the tank volume and a secure lid.
The natural killifish substrate preference is fine, soft material. For display tanks, dark sand or smooth fine gravel helps the fish feel secure and improves colour contrast. For breeding, many keepers use peat fibre or a dedicated spawning container. If you want a planted layout, rooted plants can work, but leave open feeding zones and avoid sharp decor.
This species benefits from floating plants, wood, and broken lines of sight. Fine-leaved plants and spawning mops help females avoid constant male attention. If you enjoy other killifish, compare this setup style with Aphyosemion Australe “Gold” - Gold Lyretail, which also appreciates cover, or the more surface-focused Pseudepiplatys Annulatus - Clown Killifish. In a nano system, remember that smaller volumes are less forgiving with both water quality and aggression.
Moderate lighting is best. Too much brightness can make the fish skittish unless floating cover is present. A daily photoperiod of 7-9 hours is usually enough. Dark substrate and side cover often show off the males better than intense overhead light.
Always cycle the tank for 4-6 weeks before adding annual killifish. They are less tolerant of ammonia and nitrite than many beginner fish, and stable water is one of the biggest factors in long-term success.
This species is a true carnivore. In the wild it hunts insect larvae, micro-crustaceans, and other meaty prey, so the best captive diet should reflect that. For anyone buying live killifish for sale UK or tropical killifish UK stock, feeding is one of the most important care questions: a poor diet quickly leads to faded colour, weak spawning response, and reduced killifish health.
The core diet should be frozen or live foods such as brine shrimp, daphnia, bloodworm, mosquito larvae, and high-protein micro-predator pellets if accepted. Many fish learn pellets, but some prefer moving foods at first. This is one reason they are not always the best killifish for beginners, though they can still be manageable for attentive keepers.
Rotate foods to maintain condition. Daphnia helps with digestion, brine shrimp supports colour and conditioning, and bloodworm is useful as a rich supplement rather than the only staple. Variety is the key point in any feeding plan for this fish.
For breeding pairs or trios, live foods are especially valuable. Conditioning with live brine shrimp, whiteworm, and daphnia often improves egg production. This also matters for anyone learning how to breed killifish, because nutrition directly affects fertility and hatch rates.
Feed small portions 1-2 times daily. Offer only what they can finish in a minute or two. Juveniles may need smaller, more frequent meals. Adults do best kept slightly lean rather than heavily fed.
| Time | Food | Amount |
|---|---|---|
| Morning | Frozen daphnia or brine shrimp | Small pinch, fully eaten in 1-2 minutes |
| Evening | Bloodworm or micro-predator pellet | Light feed, no leftovers |
Overfeeding causes ammonia spikes, fouled substrate, and poor water quality. Annual killifish are short-lived already, so chronic overfeeding and dirty water can shorten lifespan even further.
Aquarists often focus on appearance — the most colourful killifish and stunning males — but diet is what keeps those colours intense. Compared with a guppy, which is more forgiving on dry foods, Nothobranchius guentheri really shines on meaty fare.
This is one of the most attractive annual killifish available in the hobby. Adult males grow to about 5 cm and develop a compact but deep-bodied shape with rounded fins and striking body pattern. Depending on mood, age, and line, males show combinations of turquoise-blue scaling, red spotting or barring, warm brown to bronze body tones, and a vivid red or orange emphasis in the tail. Females are much plainer, usually beige to olive with clearer fins and little pattern. That sexual dimorphism is useful when planning groups and breeding projects.
Compared with the delicate, surface-dwelling clown killifish, this species is stockier and more robust-looking. It is also very different from long-finned forms such as the elegant Aphyosemion Australe “Gold” - Gold Lyretail. Where some killifish appeal through flowing finnage, Zanzibar Nothobranchius stand out through dense pattern and seasonal colour intensity.
People often ask whether killifish are hardy and whether they can be kept alone. In appearance terms, healthy fish answer those questions clearly: a fit male is alert, brightly coloured, eager to feed, and constantly displaying. Our photos show the intensity you can expect when fish are kept on dark substrate, fed varied live and frozen foods, and maintained in stable water.
Compatibility is where many first-time keepers make mistakes. This is not the ideal peaceful killifish for community tank choice if your goal is a mixed aquarium full of fast, active fish. Males can be pushy with one another, and females may be harassed if there is not enough cover. So, can killifish live with other killifish? Yes, but only with careful species choice and enough space. In many cases, a species-only setup is best.
The safest companions are small, calm fish that do not nip fins or outcompete them at feeding time. Think in terms of low-pressure dither fish rather than busy shoals. Good comparison and related options include Epiplatys Dageti Monroviae - Red-Chinned, Tanganyika Killifish - Lamprichthys tanganicanus, and Fundulopanchax Amieti “EDéa-Yaoundé Km 18 C”, though each has its own temperament and tank style. If you are browsing nano fish UK or colourful freshwater fish UK, choose tank mates that are not frantic surface feeders.
Avoid fin nippers, aggressive cichlids, large barbs, and boisterous livebearers. Shrimp may be eaten, especially juveniles. Fast fish can also cause stress and poor feeding. This species is not a match for a random assortment of unrelated community fish, and it has very different behaviour and mouth size from larger predatory panchax.
In a 40-60 litre tank, keep 1 male with 2-3 females and no other fish, or add only a very small number of calm companions if the aquarium is mature and heavily structured. In larger tanks, multiple males are possible, but only with careful line-of-sight breaks. For most keepers this species is best treated as a dedicated display or breeding fish rather than a casual community addition.
| Species | Compatible? | Notes |
|---|---|---|
| Pseudepiplatys Annulatus - Clown Killifish | ⚠️ Caution | Different feeding zone, but clown killifish are delicate and may be stressed by more assertive Notho behaviour. |
| Aphyosemion Australe “Gold” - Gold Lyretail | ⚠️ Caution | Possible in larger calm tanks, but species-only setups are usually safer for breeding and colour. |
| Fundulopanchax Gardneri “Akure” | ⚠️ Caution | Similar size and appetite, but male rivalry and competition can be an issue. |
| Fin-nipping barbs | ❌ Avoid | Stress, damaged fins, and poor feeding response. |
| Aggressive cichlids | ❌ Avoid | Too forceful for this small annual species. |
Always quarantine new arrivals for 2-4 weeks before adding them to a killifish tank. This reduces parasite risk and gives you time to check feeding behaviour before competition is introduced.
Whether you are comparing a blue lyretail, Norman’s lampeye, a clown killifish, or a golden wonder killifish, remember that Zanzibar Nothobranchius are best treated as a specialist species. They are excellent for keepers of rare fish UK but not ideal for a random community mix.
If you want to learn how to breed killifish, this species is one of the classic annual projects. Breeding is moderate in difficulty because adults spawn readily, but egg handling is very different from standard egg scatterers. This is where the distinction between annual and non-annual killifish care really matters.
Use a separate 20-40 litre breeding tank with soft to moderate water, gentle aeration, and a spawning tray or container filled with peat fibre or a coconut-based medium. A killifish spawning mop setup can be used for observation, but annual species usually perform best with a substrate they can dive into. Condition fish well with live and frozen foods for 1-2 weeks before pairing or grouping.
The male courts females with colour display and short chases. Spawning usually occurs low in the tank, with eggs deposited into the substrate, matching the natural seasonal strategy of the species. The biggest difference from other fish is what happens after the eggs are laid.
Eggs are collected with the peat or spawning medium, gently squeezed to damp rather than wet, then stored in a sealed bag or container for a dry incubation period. This is the heart of killifish egg incubation. Depending on temperature and line, eggs may need several weeks to months before they are ready to wet. That is why killifish eggs for sale uk and killifish eggs uk are such common searches in annual killifish circles.
Once wetted, fry can hatch quickly and need tiny live foods such as infusoria, vinegar eels, microworms, and newly hatched brine shrimp. Growth is rapid if food is abundant and water is clean. Because the species has a short life, early feeding matters a lot.
The main issues are infertile eggs, mould from overly wet storage, and low hatch rates from eggs wetted too early. Before you order, decide whether you want adults for display or a breeding project involving eggs: adults are simpler to start with, while eggs are fascinating but more technical.
Label each batch of eggs with collection date and storage temperature. Slight differences in incubation timing can affect hatch success, and careful records quickly improve results with annual species.
Among annual killifish, N. guentheri is often considered one of the easiest killifish to breed once the dry-incubation method is understood, offering a similarly exciting process to other Nothobranchius with its own timing and pattern traits.
Choosing between killifish species matters because care style, temperament, and breeding method vary a lot. The right choice depends on whether you want intense seasonal breeding, calmer community behaviour, or long-finned display fish.
| Feature | Nothobranchius guentheri “Zanzibar” | Clown Killifish |
|---|---|---|
| Max Size | 5 cm | 3.5-4 cm |
| Care Level | Moderate | Moderate |
| Temperature | 22-26°C | 23-27°C |
| Best For | Species tanks, annual breeding projects | Gentle nano displays, surface activity |
The biggest difference between this fish and the clown killifish is behaviour and breeding style. Clown killifish are more delicate, more surface-oriented, and often chosen for planted nano tanks. Zanzibar Nothobranchius are bolder feeders, more seasonal in life cycle, and more appealing to breeders who want to work with diapause eggs.
| Feature | Nothobranchius guentheri “Zanzibar” | Gold Lyretail Killifish |
|---|---|---|
| Type | Annual | Non-annual |
| Lifespan | About 1 year | Longer with good care |
| Temperament | Semi-aggressive | Generally calmer |
| Breeding | Egg diapause required | Easier wet incubation methods |
| Best For | Collectors and breeders | Display-focused aquarists |
If you want one of the most colourful killifish with a truly unusual life history, choose Zanzibar Nothobranchius. If you want a more classic display fish, compare with Aphyosemion Australe “Gold” - Gold Lyretail. If you want a stronger, more robust killifish with broad appeal, look at Fundulopanchax Gardneri “Akure”. Compared with a guppy, killifish are far more specialised and rewarding for focused keepers.
Strong killifish health starts with clean water, a varied carnivorous diet, and low stress. Because this species has a naturally short life, avoid assuming every decline is just “old age.” Poor water quality, internal parasites, and chronic stress can all cause early losses.
Healthy fish are alert, feed eagerly, hold their fins open, and show clear eyes and good body weight. Males display strong colour and active courtship. Females should look full-bodied but not bloated. A common question is how long do killifish live — expect around 1 year under good care.
Watch for ich, velvet, bacterial fin damage from fighting, and wasting caused by internal issues or poor feeding. Annual killifish can also suffer stress-related decline if kept too warm for long periods or with unsuitable tank mates. Sudden clamped fins, loss of appetite, and hanging near the bottom are warning signs.
Move affected fish to a hospital tank if possible. Improve aeration, test the water, and perform small frequent water changes. Use medication carefully and dose to the actual water volume. Prevention is always cheaper and less stressful than treatment.
Quarantine all new fish, avoid overstocking, maintain a steady temperature, and feed a varied diet. Avoid mixing them with aggressive species. Specialist fish need specialist planning.
Never use copper-based medications in tanks containing shrimp or other sensitive invertebrates. Copper can be lethal, and many mixed-tank treatments are not suitable for specialist setups.
Different killifish vary widely in hardiness. Zanzibar Nothobranchius are not fragile when kept properly, but they do require more precision than many standard community fish.
Typical behaviour is active, food-driven, and occasionally pushy. Males display to one another, flare, and patrol small territories, especially around spawning sites. Females are calmer but appreciate cover and visual breaks. This is why a species setup often works better than a busy mixed tank.
They spend much of their time in the middle and lower levels, investigating the substrate and darting toward food. During courtship, males intensify in colour and posture. In a well-designed tank, you will see natural chasing, display, and spawning dives into the breeding medium. As a killifish for small aquarium species, a trio works well in a carefully arranged tank, but crowded mixed stocking does not.
A single male can survive alone, but the species is far more interesting kept in a proper ratio. Its behaviour is one of the main reasons it remains popular with hobbyists who follow the british killifish association and annual killifish breeding projects.
When you buy killifish online UK, species identity, sex ratio, and condition matter far more than flashy claims. This Zanzibar form is selected for aquarists who want a genuine annual killifish experience: vivid males, correctly sexed groups, and fish suited to a specialist setup. We do not market them as generic community fish, because that would lead to poor outcomes. Instead, we focus on accurate care information, realistic compatibility advice, and proper packing for UK delivery.
Each batch is checked for feeding response and overall condition before dispatch. Fish are packed in insulated boxes, with seasonal heat packs in cold weather, and sent by a tracked service suitable for live fish transport. That matters for buyers searching live killifish delivery UK, where to buy killifish, or killifish for sale near me who want confidence rather than guesswork. If you are comparing eggs with adult fish, adults are ideal when you want immediate colour and an easier setup, while eggs suit dedicated breeders.
This species is a tropical freshwater annual killifish — not a marine fish, a pond fish, or a livebearer. It is for aquarists who want a short-lived but unforgettable display fish with real breeding potential. For buyers checking price and delivery, the value here is in healthy, correctly prepared stock and informed support. Order your killifish for sale UK choice today with a clear care plan and a tank designed for success.
If you enjoy specialist killifish, compare this species with Hypsolebias Picturatus “Volta Das Pedras” for another annual-style project, or try Pseudepiplatys Annulatus - Clown Killifish for a gentler nano display. For a classic long-finned alternative, see Aphyosemion Australe “Gold” - Gold Lyretail. If you prefer a stronger surface predator style, explore Aplocheilus Lineatus “Gold” - Gold Striped. Aquarists building a collection of rare freshwater fish uk may also like Fundulopanchax Amieti “EDéa-Yaoundé Km 18 C” or Tanganyika Killifish - Lamprichthys tanganicanus for a very different look and behaviour profile.
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