Trichogaster trichopterus, also known as the opaline gourami, blue gourami, and gold gourami, is a species of fish native to southeastern Asia, but also introduced elsewhere.
This gourami gets its name from the two spots along each side of its body in line with the eye, considered the third spot. This species is of minor commercial importance as a food fish in its native range and is also farmed. It is popular in the aquarium trade.
The genus Trichogaster contains many of the more popular gouramis traded in the industry, including the “Pearl gourami”, “Moonlight”, “Snake skid”, “Three spot”, “Blue”, “Silver”, “Gold”, “Opaline” and hybrids in the same genus, for example; "Lavender".
All gouramis belong to the suborder Anabantoidei and are commonly known as the labyrinth fishes. These fish are characterized primarily by an accessory breathing organ called the labyrinth organ. The labyrinth organ is located next to the gill cavities and is made up of folded membranes mounted on a bony frame. The delicate tissue has a high concentration of blood vessels and functions much like a terrestrial lung. If a labyrinth fish is denied access to the air it will drown because the gills alone will not provide sufficient oxygen to the fish.
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