Scissortail Rasbora – Rasbora trilineata

Among peaceful community fish, few species are as elegant and underrated as the Scissortail Rasbora, Rasbora trilineata. With its distinctive forked tail and shimmering silver body, this active schooling fish adds movement, contrast and a sense of natural river dynamics to any well-planned aquarium. It is hardy, adaptable and perfect for aquarists who enjoy observing natural group behaviour rather than solitary showpieces. In this article we will look at the origin, care, tank setup and breeding of Scissortail Rasboras, and show how to create an environment in which they truly thrive.

Natural habitat and appearance of the Scissortail Rasbora

The Scissortail Rasbora originates from Southeast Asia, mainly from the slow-flowing rivers and floodplains of Thailand, Cambodia, Laos and surrounding regions. In the wild it is found in large groups in open water above sandy or muddy bottoms. These habitats are often slightly cloudy, with drifting plant matter and scattered branches. Understanding this environment is key to designing an aquarium that supports their natural behaviour and keeps them stress-free and healthy.

Rasbora trilineata typically reaches between 10 and 15 cm in length, which makes it one of the larger rasboras commonly available in the hobby. The body is elongated and torpedo-shaped, built for fast, agile swimming in open water. Its base colour is metallic silver with a subtle golden sheen, especially visible under good lighting. A dark horizontal stripe runs from the gill cover to the base of the tail, bordered by lighter reflections that emphasise the streamlined profile.

The characteristic feature that gives this species its common name is the tail fin. The caudal fin is deeply forked, with each lobe outlined by a dark band. When the fish stops and starts or changes direction, the tail opens and closes like a pair of scissors, creating a very distinctive movement pattern. In a group, this synchronised motion is highly attractive and gives the aquarium an energetic but still peaceful character.

Sexual dimorphism is subtle. Females are usually slightly rounder and may appear fuller in the belly area, especially when ready to spawn. Males are a bit slimmer and sometimes display a slightly stronger contrast in the lateral stripe and tail markings, particularly when they are in peak condition. The species lives for around 5–8 years with proper care, sometimes longer when water quality and diet are optimal.

Ideal aquarium size and tank mates

Because Scissortail Rasboras are active swimmers and relatively large for a schooling fish, tank size is an important factor in long-term success. For a small group a minimum aquarium length of 100–120 cm is recommended, which usually corresponds to around 180–240 litres. The long front glass is more important than sheer volume, as these fish need horizontal swimming space. Keeping them in a short tank limits their natural behaviour and can lead to constant pacing and stress.

They are true schooling fish and should never be kept as isolated individuals. A group of at least 8–10 specimens is advisable, and larger groups of 15 or more create a far more impressive display and distribute any social tension. In smaller groups, shy individuals may become withdrawn and more susceptible to disease. A good rule is that the Scissortail shoal should be one of the dominant visual elements in the mid to upper water column of the aquarium.

When it comes to tank mates, Rasbora trilineata is peaceful and non-territorial. Suitable companions include many other community fish that share similar water parameters and temperaments. Medium-sized tetras, peaceful barbs, rainbowfish, Corydoras catfish, small loricariids and calm gouramis can all work well. Avoid very small, delicate nano fish that could be intimidated by the rasboras’ size and speed, as well as aggressive or nippy species that might harass their long tails.

Also consider the activity level of your chosen companions. Very slow fish may be overshadowed by the constant motion of a Scissortail school, while extremely boisterous species can create a chaotic environment. A balanced community with mid-level swimmers, bottom dwellers and some top-dwelling species provides visual interest and reduces competition for space. MB Store offers a range of aquariums in various sizes, allowing you to choose a tank with enough length and volume to accommodate a harmonious community with Scissortail Rasboras as the centrepiece.

Water parameters and filtration requirements

One of the strengths of Rasbora trilineata is its adaptability. It tolerates a fairly wide range of water conditions, as long as changes are not sudden and basic parameters remain stable. For long-term health, aim for a temperature between 24 and 28 °C. A pH range of about 6.0 to 7.5 suits them well, with slightly soft to moderately hard water. While they can adapt to harder water, maintaining near-neutral conditions usually brings out better colour and more confident behaviour.

Good filtration is essential because of the species’ active nature and active metabolism. A well-sized external canister filter or a powerful internal filter ensures that waste is quickly removed and that there is sufficient circulation. In their natural environment, these fish inhabit gently moving waters, so moderate flow is ideal. It should be strong enough to keep oxygen levels high and distribute heat, but not so intense that the fish have to fight constantly against the current.

Stable water quality is far more important than chasing a specific number. Ammonia and nitrite should always be at zero, and nitrate kept as low as reasonably possible through regular water changes and proper feeding. Weekly water changes of 25–40 percent are a sensible routine in most community aquariums. Using a good-quality water conditioner helps neutralise chlorine and chloramine, which might otherwise damage fish gills and beneficial bacteria.

MB Store provides not only tanks but also filtration systems, heaters, test kits and related equipment that make it easier to maintain stable conditions. With the right combination of filter capacity, heater wattage and monitoring tools, even beginner aquarists can create an environment where Scissortail Rasboras remain active, disease-resistant and beautifully coloured for many years.

Aquarium layout, plants and decorations

Designing the interior of a Scissortail Rasbora aquarium is an opportunity to combine aesthetics with the biological needs of the fish. Because Rasbora trilineata is a mid to upper water column swimmer, the aquascape should allow for open areas in the centre and front. Reserve dense planting for the back and sides of the tank, leaving open corridors for the school to move freely. This layout not only mimics their natural habitats but also creates a pleasing sense of depth for the viewer.

A dark substrate, such as fine sand or smooth gravel in shades of brown or black, enhances the silver and gold reflections of the fish. It also helps shy individuals feel more secure, as bright substrates can increase stress. Scattertings of driftwood branches and a few pieces of rock or root-like decorations can break up sight lines and provide zones where the fish can retreat if spooked, without compromising swimming space.

Plant choice should focus on hardy, adaptable species that handle moderate flow. Background plants like Vallisneria, Hygrophila, Limnophila or tall stems of Rotala create a lush green curtain behind the open area. For midground and foreground, clumps of Cryptocoryne, smaller sword plants or low-growing stems add structure. Floating plants, used sparingly, can diffuse light and provide a sense of security, though it is important not to cover the entire surface, as Scissortails appreciate open space and good gas exchange.

Lighting does not need to be extremely intense for this species, but a well-chosen LED system will highlight their shimmering bodies and tail pattern. If light is too harsh, use plants and hardscape to create shaded regions where the fish can retreat. MB Store carries a full selection of lighting options, substrates, filters and decorative elements, enabling you to build a visually coherent and biologically suitable tank for Scissortail Rasboras and their companions.

Feeding habits and nutrition

Scissortail Rasboras are omnivorous with a strong preference for small invertebrates and plankton in the wild. In the aquarium they are unfussy and accept a variety of foods, which makes them suitable both for beginners and advanced hobbyists. A high-quality flake or small granular food can form the basis of their diet, provided it offers balanced protein, lipids, vitamins and minerals. Choose formulations designed for tropical community fish to support immune health and colour development.

To unlock their full potential, supplement dry food with regular offerings of frozen or live foods. Items such as daphnia, bloodworms, brine shrimp and cyclops are eagerly taken and stimulate natural hunting instincts. This variation not only enriches their diet but also tends to intensify the contrast of the lateral stripe and the clarity of the scissor-like tail pattern. When feeding live foods, ensure they come from reliable sources to avoid introducing parasites or pathogens.

Feeding frequency is typically two to three times per day in modest amounts that the fish can consume within a few minutes. Because Scissortail Rasboras are fast and agile, monitor that slower tank mates receive their share of food. Uneaten food should not accumulate on the substrate, as it decomposes and degrades water quality. It is often better to provide several small feedings rather than a single large one.

A well-planned diet contributes significantly to disease prevention. Adequate vitamins, especially vitamin C and essential fatty acids, support immune function and wound healing. MB Store offers a wide assortment of premium fish foods, both dry and frozen, making it easy to design a varied menu. Combining several types of food also keeps fish interested and active during feeding time, adding to the enjoyment of watching your Scissortail shoal patrol the tank.

Behaviour, schooling dynamics and health

One of the main reasons aquarists choose Scissortail Rasboras is their behaviour. They spend most of their time in open water, often forming loose schools that periodically tighten when startled or excited. Observing the school change shape, accelerate and then relax again is part of the appeal. When kept in suitable numbers, they exhibit confident, exploratory behaviour, constantly cruising the tank but rarely acting aggressively towards other fish.

Within the group a subtle hierarchy develops, though it is usually expressed through short bursts of chasing rather than outright aggression. These chases are typically harmless and help maintain social structure. Problems arise primarily if the group is too small or if the tank is cramped, in which case stress may lead to fin damage or opportunistic infections. Another important aspect is that Scissortails are highly responsive to sudden movements outside the tank; a background or strategic placement of the aquarium can reduce spooking.

In terms of health, Rasbora trilineata is generally robust when water quality and diet are appropriate. Common freshwater issues such as Ich, fin rot or bacterial infections may appear if the fish are weakened by poor conditions, overcrowding or rough handling. Preventive care is far more effective than cure. Quarantine any new arrivals, maintain consistent maintenance routines and observe daily for signs of clamped fins, reduced appetite, laboured breathing or abnormal swimming behaviour.

When early symptoms are noticed, isolating affected individuals in a separate hospital tank and using suitable medications can often resolve the situation quickly. Good filtration, adequate oxygenation and stable temperatures all reduce stress and improve resilience. MB Store provides not only hardware but also water conditioners, bacterial starters and other products that support the biological stability of your aquarium, helping your Scissortail Rasboras remain active and graceful year after year.

Breeding Scissortail Rasboras in the aquarium

Breeding Rasbora trilineata is somewhat more challenging than maintaining them, but it is achievable for dedicated aquarists willing to provide the right conditions. They are egg scatterers that show no parental care. Spawning usually occurs in the early morning when environmental cues such as rising temperature, increased feeding with live food and a slight drop in hardness simulate the onset of the rainy season typical of their native range.

To encourage breeding, prepare a separate spawning tank with soft, slightly acidic water and a gentle sponge filter to avoid sucking in eggs or fry. A bare bottom or a large spawning grid can be combined with fine-leaved plants or artificial spawning mops where eggs can fall out of reach of the adults. Introduce a well-conditioned pair or a small group, ideally with females that appear plump and males that display strong markings and energetic behaviour.

During courtship, males may chase females and display their lateral stripe and tail pattern more intensely. Eggs are scattered among plants or over the bottom and are transparent to slightly yellowish. After spawning, it is best to remove the adults, as they will readily eat both eggs and emerging fry. Depending on temperature, hatching occurs within a day or two. The fry initially consume their yolk sacs, then require infusoria or commercially prepared liquid fry foods before they are large enough for freshly hatched brine shrimp.

Raising the fry demands careful attention to water cleanliness and feeding frequency, as young fish are sensitive yet need constant access to small food items. Frequent small water changes with matching parameters help avoid accumulation of waste. While breeding Scissortail Rasboras is not as straightforward as some livebearers or dwarf species, it is extremely rewarding. Successfully rearing a new generation provides deeper insight into the species and adds a new level of satisfaction to your aquarium project.

Choosing the right equipment and using MB Store resources

Setting up a stable, attractive environment for Scissortail Rasboras depends heavily on selecting appropriate equipment. A tank with sufficient length, reliable filtration and a properly sized heater forms the foundation. To this you add lighting suited to your plant choice and the visual effect you desire, plus accessories like thermometers, timers, nets and cleaning tools. Each of these elements contributes to long-term success and ease of maintenance.

MB Store specialises in aquariums and accessories tailored to both beginners and advanced enthusiasts. You can find complete sets that include tank, filter, heater and light, ideal for those starting their first community aquarium, as well as individual components for custom builds. By matching equipment capacity to your planned stocking level and tank size, you reduce the risk of problems such as unstable temperature, insufficient filtration or poor illumination.

In addition to hardware, MB Store stocks substrates, decorative elements, conditioners, test kits and a thoughtful selection of foods. This makes it possible to design a coherent system where all parts support one another. Whether your goal is a natural-looking, plant-rich habitat dominated by a large group of Scissortail Rasboras, or a mixed community where they share space with other peaceful fish, having the right tools and supplies on hand transforms the project from a challenge into a manageable, enjoyable process.

Long-term care, maintenance and aquarist satisfaction

Long-term success with Scissortail Rasboras is built on consistency. Once the aquarium is properly cycled and stocked, the daily routine becomes relatively simple: regular observation, scheduled feeding and periodic maintenance. Watching your shoal glide through the water, responding to movements and interactions within the tank, quickly becomes a relaxing ritual that many aquarists value as a counterbalance to daily stress.

Maintenance tasks revolve around water changes, filter cleaning and plant care. Weekly partial water changes keep nitrates and dissolved organics under control, while occasional filter rinsing in tank water preserves the beneficial bacteria that process waste. Plant trimming maintains open swimming lanes and prevents overgrowth. None of these tasks are overly demanding when planned and carried out consistently, and the visual reward is considerable.

Scissortail Rasboras are excellent ambassadors for the aquarium hobby. Their combination of size, schooling behaviour, resilience and aesthetic appeal makes them suitable for both spacious living-room displays and more specialised setups. With proper planning, appropriate equipment from MB Store and a willingness to learn from your observations, you can create a vibrant, dynamic aquatic environment where Rasbora trilineata shows its full beauty and natural grace.

FAQ

How many Scissortail Rasboras should be kept together?
Scissortail Rasboras are true schooling fish and should be kept in groups of at least 8–10 specimens. Smaller numbers often result in shy, stressed fish that hide more and show less natural behaviour. Larger groups of 15 or more distribute social pressure and create a more impressive display, especially in long tanks where the shoal can swim freely along the front glass.

What tank size is recommended for Scissortail Rasboras?
Because they are active, relatively large rasboras, a tank with a minimum length of 100–120 cm is recommended, usually around 180–240 litres. The horizontal swimming space is more important than height. In a cramped tank, they cannot express their natural schooling behaviour and may become stressed. Extra volume also stabilises water parameters and makes maintenance easier.

Are Scissortail Rasboras suitable for beginners?
Yes, they are generally suitable for beginners who can provide an adequately sized, properly cycled aquarium. They are hardy, adaptable to a range of water parameters and peaceful towards other fish. The main requirement is enough space and a compatible community. With a good filter, regular water changes and appropriate feeding, even new aquarists can keep them successfully for many years.

What do Scissortail Rasboras eat in the aquarium?
In captivity they accept high-quality flake or small granules as a staple, ideally formulated for tropical community fish. For best health and colouration, this base should be supplemented with frozen or live foods like daphnia, bloodworms or brine shrimp. Offering a varied menu encourages natural hunting behaviour, supports immune function and helps maintain strong growth and vibrant appearance.

Can Scissortail Rasboras be kept with shrimp and small invertebrates?
Adult Scissortail Rasboras are generally peaceful but will opportunistically eat very small shrimp or shrimplets if they can fit them in their mouths. Larger, well-established shrimp may coexist, but breeding success might be limited. If your main goal is shrimp reproduction, it is better to choose smaller, less predatory fish. Otherwise, accept that some young shrimp will likely become food.