Giant gourami

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Giant gourami
Osphronemus Gourami (better).png
Adult
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Anabantiformes
Family: Osphronemidae
Genus: Osphronemus
Species:
O. goramy
Binomial name
Osphronemus goramy
Giant goramy range.svg
Native range in green (widely introduced elsewhere, not shown)
Synonyms
  • Trichopus goramy (Lacépède, 1801)
  • Trichopodus mentum Lacépède, 1801
  • Trichopode mentonnier Lacépède, 1801
  • Trichopus satyrus G. Shaw, 1803
  • Osphromenus satyrus (G. Shaw, 1803)
  • Osphromenus olfax G. Cuvier, 1831
  • Osphromenus notatus G. Cuvier, 1831

The giant gourami (Osphronemus goramy) is a species of large gourami native to freshwater habitats in Southeast Asia, with its occurrence in other locations due to introductions. This species is commercially important as a food fish and is also farmed.[2] It can also be found in the aquarium trade.[3] The species has been used for weed control, also on highly invasive aquatic plants like Salvinia molesta, as the giant gourami can be a voracious herbivore.[4][5]

It is capable of breathing moist air, so can survive out of water for long periods. It is much larger than most gouramis (only the other Osphronemus species reach a similar size), growing to a maximum standard length of 70 cm (28 in), though most are only around 45 cm (18 in).[3] In colour, it is a pale to golden yellow, with silvery, pale blue stripes running vertically along its body. Females can be identified by their thicker lips. Giant gouramis build nests using weeds and twigs.

Distribution and habitat[edit]

The giant gourami is native to rivers, streams, marshes, swamps and lakes in Southeast Asia, where reported from the lower Mekong of Cambodia and Vietnam, and Chao Phraya and Mae Klong of Thailand, as well as river basins in the Thai-Malay Peninsula, Sarawak of Malaysia, and Java, Sumatra and West Kalimantan of Indonesia.[1][3] However, the exact limits of the natural range are often labelled with uncertainty due to confusion with the other Osphronemus species (which only were scientifically described in 1992 and 1994) and the widespread release of giant gouramis outside their native range.[6][7] For example, both the giant gourami and elephant ear gourami have been reported from the middle Mekong, and both the giant gourami and Osphronemus septemfasciatus have been reported from Borneo in the Kapuas River and river basins in Sarawak. However, middle Mekong records of the giant gourami are likely misidentifications of elephant ear gouramis (the only place in the Mekong basin where the giant gourami likely occurs naturally are in the southernmost part, like tributaries originating in the northern Cardamom Mountains).[8] The presence of giant gouramis in Borneo is possibly the result of introductions.[7] The final species in the genus, the giant red tail gourami, is restricted to Sabah where the others do not occur. This suggests that the different Osphronemus species originally had allo- or parapatric distributions.[6][7]

Whether deliberate or by accident, giant gouramis have been introduced widely as food fish. In Asia, this has expanded their range from southern China to India and Sri Lanka, and in other continents they are now found in Australia, Mauritius, Réunion, Madagascar and elsewhere.[9] Translocations within Southeast Asia likely started in ancient times. Even Europeans recognized its value as a food fish several hundred years ago. For example, Georges Cuvier (1769–1832) suggested that it should be introduced to the French colonies.[9]

In aquaria[edit]

Tank specifications[edit]

Albino giant gourami

The giant gourami is also popular in aquaria. Preferably, the tank should have a dark bottom, and densely planted edges, with room left in the center of the tank for them to swim. They prefer the company of other fish of similar sizes and temperament. They are easy to keep at three months old at around 7.5 cm or 3 in long. At this age, they have a pronounced beak. They can grow rapidly given sufficient food and space to move. Even under less than ideal conditions, gourami can grow from 7.5 cm to 50 cm in four years. At this age, in addition to the rounded face, a mature giant gourami will have begun to develop the hump just above its eyes.

A gourami in a community tank will snap and charge any other fish which are small enough for it to bully. Like most aquarium dwellers, giant gourami can be quickly raised with larger, more passive fish. However, if other fish are added to a tank, either large or small, they might be killed within a short period.

Diet[edit]

Gourami tend towards herbivory, preferring algae-based foods, but will eat meaty foods. An algae-based flake food, along with freeze-dried bloodworms, tubifex, and brine shrimp, provides these fish with the proper nutrition while young. Once of significant size, they can be fed legumes, partially or fully cooked fibrous or starchy vegetables, or fruits.

Breeding[edit]

The giant gourami is an egg layer, and the male will build a bubble nest before spawning. The male and female are distinguished by the dorsal fins and body color. The dorsal fin on the male ends in a point, and the body is darker changing to nearly black during spawning. When breeding, the water in the tank should be decreased to about 20 cm (8 in) deep and the temperature should be 28 °C (82 °F). After spawning, the female should be removed to a separate tank as the male will jealously guard the eggs, in a captive environment, sometimes becoming aggressive towards the female. The eggs hatch in 24 hours. They must be kept in a dark aquarium.

As food[edit]

Partly in consequence of its size, the giant gourami is a significant food fish, and in its native regions it has been harvested as a customary food source.[10] In Asian cuisine, gourami is highly valued as food due to its thick flesh, pleasant texture as well as its tasty flavour. Unlike carp and milkfish, gouramis do not have fine bones within their flesh, which render them easy to consume, thus elevate its economic value. In Southeast Asian market, gourami is one of the most highly-valued freshwater food fish. Gourami flesh is rich in protein and minerals.[11]

It is a popular food fish in Indonesian, Malaysian and Thai cuisines. Gouramis are particularly popular in Sundanese cuisine of Indonesia,[12] where they often being fried as ikan goreng, grilled as ikan bakar or cook with spice inside a banana leaf wrap as pepes. In some parts of Southeast Asia, they are salted to preserve and prolong shelf life.

References[edit]

  1. ^ a b Vidthayanon, C. (2012). "Osphronemus goramy". The IUCN Red List of Threatened Species. 2012: e.T180720A1655531. doi:10.2305/IUCN.UK.2012-1.RLTS.T180720A1655531.en.
  2. ^ "Gourami".
  3. ^ a b c Froese, Rainer and Pauly, Daniel, eds. (2014). "Osphronemus goramy" in FishBase. February 2014 version.
  4. ^ FAO - Weed control
  5. ^ Dinalankara, Senura; Tharaka Sahan Chandrasiri; Dakshitha Dias; Kokila Hettiarachchi (2018). Vision Based Automated Biomass Estimation of Fronds of Salvinia molesta. University of Moratuwa.
  6. ^ a b Roberts, T.R. (1992). Systematic revision of the Southeast Asian anabantoid fish genus Osphronemus, with descriptions of two new species. Ichthyol. Explor. Freshwat. 2(4): 351–360
  7. ^ a b c Roberts, T.R. (1994). Osphronemus exodon, a new species of giant gourami with extraordinary dentition from the Mekong. Natural History Bulletin of the Siam Society 42(1): 67–77
  8. ^ Rainboth, W.J. (1996). Fishes of the Cambodian Mekong, p. 218. FAO, United Nations. ISBN 92-5-103743-4.
  9. ^ a b Roberts, T.R. (1989). The freshwater fishes of Western Borneo (Kalimantan Barat, Indonesia). Memoirs of the California Academy of Sciences. 14: 1–210.
  10. ^ Cultured Gourami in Bogor, Indonesia
  11. ^ "Kandungan Protein Ikan Gurame". Neraca (in Indonesian). 7 December 2013.
  12. ^ "Resep Ikan Gurame".