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Care guide · Freshwater · fish

Scissortail Rasbora

Rasbora trilineata

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The Scissortail Rasbora (Rasbora trilineata), also called the three-lined rasbora, is an active shoaling fish from Southeast Asia. Its characteristic tail movement while resting inspired its common name. Fish in trade are often juveniles, so plan for an adult size of about 15 cm and an aquarium with ample swimming room. The species is peaceful, but its size makes it unsuitable with tiny fish. A tightly fitting lid matters because this surface-dweller is known to jump. Offer a varied diet and keep water quality high. After feeding, check that less assertive fish also reach enough food.

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At a glance

Temperature
22–25 °C
pH
6.5–7.5
GH
2–12 °dGH
Aquarium length
At least 120 cm
Minimum aquarium volume
At least 243 L
Adult size
At least 15 cm
Group size
At least 6 individuals
Temperament
Peaceful

About this species

The specialist aquarium profile Seriously Fish gives a maximum of about 15 cm standard length. FishBase lists 13 cm total length. Since standard and total length are not equivalent, the values are not converted; the larger SL value is used for space planning. Three dark longitudinal lines and the scissoring tail movement are characteristic. The species lacks the red tail colour seen in some related rasboras.

Natural habitat

The species occurs in the Chao Phraya and lower Mekong basins, the Malay Peninsula, Sumatra and Borneo. It has been recorded from lakes, swamps and slow-flowing waters, often in lowland areas. An aquarium with open swimming room, plants along parts of the margins and gentle to moderate flow suits its known ecology.

Aquarium and layout

Seriously Fish recommends at least about 120 × 45 × 45 cm, roughly 243 litres, for an active group. A long footprint and open swimming space matter as much as volume. Use a mature filter and secure the aquarium carefully; the fish can escape through small gaps. A large shoal also needs adequate filtration and consistent maintenance. The stated volume alone does not guarantee that every 243-litre aquarium is suitable.

Water conditions

Species-specific care data give 22–25°C and GH 2–12 dGH. Seriously Fish notes pH may vary from 5 to 8 by origin, with 6.5–7.5 usually working well in aquaria. FishBase lists pH 6–8 and GH 5–12. Keep temperature and water quality stable and acclimate according to the stock’s origin. Do not change water chemistry abruptly.

Behaviour and group size

The Scissortail Rasbora is very peaceful and should be kept in a group of at least six. A shoal helps the fish feel secure and display natural swimming behaviour. Choose companions carefully by adult size, temperament and feeding competition. Because this rasbora grows large, it may prey on very small fish or juvenile shrimp. Pairing with the red-tailed rasbora is conditional: both shoals must be complete and the aquarium very spacious.

Feeding

Wild food consists mainly of aquatic and terrestrial invertebrates, especially insects. The fish accepts suitably sized dried food, but this should not be its only food. Vary the diet with small live or frozen prey such as Daphnia and Artemia. Match portions to the mouth and check that all fish can feed. Remove leftovers to maintain water quality.

Breeding

The Scissortail Rasbora scatters eggs and provides no brood care. The available species-specific aquarium source gives limited breeding details, so fixed outcomes or fry counts cannot be promised. For deliberate breeding, use a separate prepared tank and protect eggs from adults. Newly hatched larvae initially require very fine food.

Sources & review

This care guide draws on several specialist sources and was last checked on .

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