Rasbora – Freshwater Fish Species

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Rasbora - Freshwater Fish Species

Spotted Rasboras – Boraras Maculatus

This rasbora is the smallest member not only of its group but also of the entire cyprinid family. The Spotted Rasbora has a long, narrow caudal peduncle with three dark spots along the side of the body. The pattern of dark markings differs between individuals. The males are recognizable by their brighter coloration and flat underparts; females have a slightly curved lower outline. Spotted Rasboras, which look best in shoals, can be mixed with suitable companions of a similar size, including other small rasboras. A pair will spawn in a breeding tank that is well planted with Sagittaria and cryptocorynes, but they will eat their eggs if left there. About 50 eggs are produced, and they hatch in about 36 hours. Very fine fry food is essential for the young fish at first.

Characteristics

  • ORIGINS Southeast Asia, extending from western Malaysia southward to western Sumatra
  • SIZE 1 in (2.5 cm)
  • DIET Flake and live foods
  • WATER Temperature 75–79°F (24–26°C); soft (50 mg/l) and acidic (pH 6.0–6.5)
  • TEMPERAMENT Peaceful and social.
Spotted Rasbora - Boraras Maculatus
Spotted Rasbora – Boraras Maculatus

Glass Rasbora – Boraras Urophthalmoides

These small, attractive rasboras have a red stripe running along each side of the body. There is a broader, iridescent area beneath this stripe that gradually tapers to a point along the caudal
peduncle. Male Glass Rasboras have a very evident white spot at the base of the dorsal fin and a larger adjacent black area, both of which the females lack. Relatively dark surroundings, with bogwood decor and suitable plants, should help to overcome the natural nervousness of these fish. It has proved possible to breed Glass Rasboras in a planted spawning tank, provided that the water temperature is kept slightly higher than that in the main aquarium, at up to 82°F (28°C). About 50 eggs are laid on the underside of the leaves of cryptocoryne plants, after which the adult pair should be removed to protect the eggs. They hatch after about two days.

Characteristics

  • ORIGINS Southeast Asia, where its distribution extends from Vietnam south to Sumatra
  • SIZE 11⁄2 in (3.5 cm)
  • DIET Flake and live foods
  • WATER Temperature 73–77°F (23–25°C); soft (50 mg/l) and acidic (pH 6.0–6.5)
  • TEMPERAMENT Peaceful and social
Glass Rasboras - Boraras Urophthalmoides
Glass Rasbora – Boraras Urophthalmoides

Axelrod’s Rasbora – Sundadamo Axelrodi

These beautiful fish are instantly recognizable, since their body is fluorescent green on top and reddish below, with red coloration also evident on the ventral fin. Axelrod’s Rasboras appear to lack the sensory lateral line along the sides of the body, which is perhaps compensate for their large eyes. Discovered in 1976, this species was named after Dr. Herbert Axelrod, a leading American ichthyologist and fishkeeper.

Characteristics

  • ORIGINS Southeast Asia, where this species is restricted to the Indonesian island of Sumatra
  • SIZE 11⁄4 in (3 cm)
  • DIET Flake and live foods
  • WATER Temperature 73–79°F (23–26°C); soft (50 mg/l) and acidic (pH 6.0–6.5)
  • TEMPERAMENT Peaceful and social
Axelrod’s Rasbora - Sundadamo Axelrodi
Axelrod’s Rasbora – Sundadamo Axelrodi

Orange-Finned Rasboras – Rasboroides Vaterifloris

The appearance of the Orange-Finned Rasbora differs across its range: individuals found between Valallavites and Meegahatenne are predominantly red, while specimens from around Gilimale on the Kaluganga River are greenish. The depth of the orange coloration around the eye socket also varies. Males are more colorful and slimmer-bodied than females. In addition to their regular diet, OrangeFinned Rasboras will sometimes take small amounts of pollen, available in health-food stores. Rich in protein, pollen can help to encourage spawning, as can live foods. Orange-Finned Rasboras are often the only fish that occur in parts of their natural habitat, but they can still be mixed with other nonaggressive fish in community aquariums. Their isolation in the wild may also explain why they have a shorter lateral line than other rasboras: being less exposed to predators, they may not have such a great need for this sensory warning system.

Characteristics

  • ORIGINS Southern Asia, restricted to the island of Sri Lanka
  • SIZE 11⁄2 in (4 cm)
  • DIET Live foods, plus flake
  • WATER Temperature 77–84°F (25–29°C); soft (50 mg/l) and acidic (pH 6.0–6.5)
  • TEMPERAMENT Peaceful
Orange-Finned Rasboras - Rasboroides Vaterifloris
Orange-Finned Rasbora – Rasboroides Vaterifloris

Big-Spot Rasboras – Rasbora Kalochroma

In spite of its relatively large size, the Big-Spot Rasbora is rather sensitive to water quality, and its true beauty will be apparent only if conditions are optimal. A dark base in the aquarium and subdued lighting are also needed for this fish to look its best. Big-Spot Rasboras should be kept in groups, but their shoaling instincts are not as strong as in other rasboras. Spawning behavior in home aquariums has not been documented, but it is probably similar to that shown by other rasboras.

Characteristics

  • ORIGINS Southeast Asia, where it is found in parts of Malaysia, Sumatra, and Borneo
  • SIZE 4 in (10 cm)
  • DIET Flake and live foods
  • WATER Temperature 77–82°F (25–28°C); soft (50 mg/l) and acidic (pH 6.0–6.5)
  • TEMPERAMENT Peaceful and social
Big-Spot Rasbora - Rasbora Kalochroma
Big-Spot Rasbora – Rasbora Kalochroma

Long-Band – Rasbora Einthovenii

The dark stripe along the midline of this rasbora extends from the mouth all the way through to the caudal fin. It is broader in males, which have a purplish cast to the body and a hint of red on the dorsal fin; this coloration is most obvious when they are in top condition. Females, in contrast, are a more greenish shade. A spawning tank for these fish needs a concentration of fine-leaved plants at one end in which eggs can be laid.

Characteristics

  • ORIGINS Southeast Asia, occurring in Malaysia, Sumatra, and Borneo
  • SIZE 4 in (10 cm)
  • DIET Flake and live foods
  • WATER Temperature 72–77°F (22–25°C); soft (50 mg/l) and acidic (pH 6.0–6.5)
  • TEMPERAMENT Peaceful and social
Long-Band Rasbora - Rasbora Einthovenii
Long-Band Rasbora – Rasbora Einthovenii

Scissortail Rasbora – Rasbora Trilineata

The striped pattern on the sides of the Scissortail Rasbora’s silvery body becomes more evident toward the caudal fin. This rasbora’s common name derives from the way the deep fork of the caudal fin tends to close up, like scissor blades, as the fish moves through the water. The size and shoaling behavior of Scissortail Rasboras means that they will benefit from being housed in a relatively long aquarium, where planting is restricted to the sides of the tank.

Characteristics

  • ORIGINS Southeast Asia, occurring in parts of Malaysia, Sumatra, and Borneo
  • SIZE 6 in (15 cm)
  • DIET Flake and live foods
  • WATER Temperature 73–77°F (23–25°C); soft (50 mg/l) and acidic (pH 6.0–6.5)
  • TEMPERAMENT Peaceful and social
Scissortail Rasbora - Rasbora Trilineata
Scissortail Rasbora – Rasbora Trilineata

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