Bird Families

Spotted Eyeball / Pyriglena atra


Rasbora cuneiform has been in aquariums for over a century. Belongs to the cyprinidae family. Also known as rasbora harlequin, wedge-shaped, and heteromorph. Habitat: reservoirs of Malaysia, Thailand, Sumatra and Singapore.


The size of the fish does not exceed 5 cm. Rasbora fell in love with aquarists for its interesting color and unpretentious maintenance and care.


The body is oblong, laterally flattened. On the sides there are black or bluish spots resembling a wedge and extending to the tip of the tail. The dorsal fin and rays of the tail are orange. There are body color options of copper, crimson, reddish, beige or olive.


Harlequins are active. They live in the upper and middle layers of water. Rasbora is a peaceful and friendly fish that keeps in a flock.

Life span

Rasbora lives 3-5 years in good conditions. Much less will live with poor care and solitary confinement.

There are subspecies of heteromorphs, artificially bred. Selective species are less popular than the natural form. Wedge-spotted rasbora gave rise to subspecies:

  1. Blue Harlequin. The body of the fish is bluish with a steel sheen.
  2. Black Harlequin. The fish is dark in color. Looks spectacular in herbalists.
  3. Golden Harlequin. The owner of the abdomen is golden.


You will need a medium sized aquarium with standard equipment. Keeping in a flock of at least 10 individuals.


The volume of an aquarium for a school of 10 fish starts from 60 liters. Place a large flock of 15 or more individuals in an 80 liter aquarium. Choose an elongated rectangular tank. A cover is required, as the rassors jump out of the water.

Water parameters

In nature, Rasbora lives in streams with soft acidic water and peat bogs. Optimal parameters:

  1. hardness 5–12 dGh,
  2. acidity 6-7,
  3. the water temperature is 24-28 degrees.

Change a quarter of the water volume and clean the soil every week. Check the fluid periodically with level tests.


Choose plants from the natural habitat of harlequins:

  1. cryptocoryne,
  2. aponogeton,
  3. ferns,
  4. hygrophilus,
  5. blue.

Create a dense vegetation in the aquarium where the fish can hide. Place floating plants such as Javanese moss or duckweed on the surface.


Place fine pebbles, gravel or dark sand on the bottom. Artificially colored stones are not suitable, as chemical dyes are dangerous for fish. Too light soil is also undesirable due to strong light reflection and less heating.

White soil will irritate the fish and will not give the plant roots enough warmth.


You will need a filter and a compressor, if necessary, a heater. There is little or no water movement in natural harlequin waters, so select a low-power internal filter.


Subdued light suits the fish. Daylight hours last up to 8 hours. Avoid sunlight to avoid blooming water. Make sure the plants have enough light.


Rasbora is an omnivorous aquarium fish. Feeding with live or frozen food is obligatory 2-3 times a week.

  1. dry food,
  2. gammarus,
  3. brine shrimp,
  4. daphnia,
  5. bloodworm,
  6. pipe worker.

Create a varied diet based on animal products. Add lettuce leaves and scalded oatmeal as a plant food. Serve in small portions for the fish to eat in 5 minutes. The food particles should be small so that the feed is conveniently absorbed by the feed. Use a feeder that prevents food from scattering throughout the aquarium.


The list of neighbors that this peaceful fish will be happy with is extensive:

  1. guppy,
  2. tetras,
  3. neons,
  4. zebrafish,
  5. other types of collection and micro-collection,
  6. iris,
  7. platies,
  8. swordsmen,
  9. barbs,
  10. cockerels (females),
  11. corridors.

Suitable non-aggressive proportional fish. Create conditions that suit the heteromorph and neighboring species. Complete incompatibility with predators, large fish with a complex character. Do not hook up to rasbora:

  1. cichlids,
  2. gourami,
  3. piranha,
  4. goldfish,
  5. large catfish.


Breeding fish is not given to beginners, since the breeding process requires increased attention to water parameters. Water tests will be required to maintain consistent hardness and acidity. Breeding takes place in a separate aquarium.

Sex differences

Sexual maturity of fish occurs at 9–12 months. The female differs from the male in a rounded abdomen and a rounded wedge-shaped spot. In males, the spot on the body is sharp at the end. Males are slimmer and brighter than females.


For the spawning box, prepare a 30 liter aquarium. Set the temperature to 28 degrees to stimulate fish spawning. Monitor the fluid purity and hardness (no more than 2 dGh). The water level is 15–20 cm. Plant plants with wide leaves. Before settling in pairs, treat the spawning box with an antiseptic. Leave the lighting dim.


Keep females and males separate for 10-15 days. Select males that are slightly older for successful spawning. The ratio of males to females is 2: 1. The pair spawns in 25–70 hours. The process takes 2 hours. The female lays sticky eggs on the back of the leaves. Some of the eggs fall on the ground, and if there is no separator mesh, the eggs will be eaten. The female lays 200–300 eggs. Remove broodstock from spawning grounds to preserve offspring.

Fry care

After a day, larvae emerge from the eggs. The fry move and feed within a week after hatching. Start feeding the fry:

  1. ciliates,
  2. liquid feed,
  3. egg yolk
  4. cyclops,
  5. nauplia,
  6. microworm.

Increase the water hardness gradually to get the fry accustomed to the conditions of a shared aquarium. Maintain hygiene in the aquarium. Change 10% of the liquid to clean, settled daily.


The fish has a strong immune system. Rasbora heteromorph is susceptible to diseases:

  1. Cold. When the temperature drops below 20 degrees, the fish's immunity may fall.
  2. Oodinoz. Parasitic disease. A brown coating appears on the body of the fish. Introduced with new fish, plants. It is treated with copper sulfate at the rate of 0.2 mg per 1 liter of water. When processing, raise the temperature to 28-30 degrees. For the prevention of fry, add 1 tbsp for every 10 liters. a spoonful of table salt.
  3. Poisoning. Under improper conditions, the level of ammonia in the water exceeds the permissible values, poisoning the fish. Unsettled tap water is also dangerous for fish. Siphoning soil and water changes will correct the situation.
  4. Temperature shock. It occurs when there is a sharp change in temperature or being in too warm or cold water.
  5. Hypoxia. Fish lack oxygen, which makes them vulnerable to disease. If the population of the aquarium swims in the upper layers of water and swallows air bubbles, provide the fish with adequate aeration and make sure that the pets have enough free space. In an overcrowded aquarium, the oxygen concentration is low.
  6. Inflammation of the gastrointestinal tract. Caused by the frequent use of dry food and a poor diet. To improve the condition of the fish, do not feed them for several days, then serve quality live food.

Reviews (1)

Aquarists confirm that the wedge-shaped rassor looks spectacular in the aquarium. The experience of solitary confinement indicates the need to settle in a flock: the fish becomes aggressive and restless. Difficulties in breeding and sex determination are noted. There is an ongoing debate among aquarists about the right conditions for spawning.

Average rassor price depends on the size. A fish up to 2 cm in size costs an average of 40 rubles, up to 3 cm - 120 rubles, and up to 4 cm - 230 rubles.


  1. When buying feed for rassor, carefully look at the expiration date. Do not purchase feed by weight.
  2. Place newly acquired fish in a quarantine tank for 3-4 weeks. During this time, possible diseases appear that could be brought into the general aquarium. If the fish show no signs of discomfort, stock them in a shared aquarium.
  3. Use peat filtration to acidify the water.
  4. A cover equipped with wires and a bulb holder will create less hassle when installing the light.
  5. Choose a transparent siphon to make cleaning easier.

This view is confused with espes and Hengel because of the similar appearance. The description of these species is largely identical: they come from the same conditions, have a similar character and keep in flocks. Fish are singled out in a separate genus due to the fact that they stick eggs to the leaves of plants, and do not scatter them in the water column.