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Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them. These eggs do not have a shell and would dry out in the air. Even air-breathing amphibians lay their eggs in water, or in protective foam as with the Coast foam-nest treefrog, Chiromantis xerampelina.
The Siamese fighting fish (Betta splendens), commonly known as the betta, [2] is a freshwater fish native to Southeast Asia, namely Cambodia, Laos, Myanmar, Malaysia, Indonesia, Thailand, and Vietnam. [3][4] It is one of 76 species of the genus Betta, but the only one eponymously called "betta", owing to its global popularity as a pet; Betta ...
The nests are constructed as a place for fertilized eggs to be deposited while incubating and guarded by one or both parents (usually solely the male) until the fry hatch. Bubble nests can also be found in the habitats of domesticated male betta fish. Nests found in these types of habitats indicate a healthy and happy fish.
Female specimen, also from near Baguas. Betta balunga is a species of gourami endemic to the island of Borneo, and whose species name derives from the location where it was first described - the Balung River in Sabah, eastern Malaysia. [3] It inhabits forest and blackwater streams, and grows to a length of 4.9 cm (1.9 in). [4][5]
The peaceful betta or crescent betta (Betta imbellis) is a species of gourami native to Southeast Asia. Betta imbellis has a pair of suprabranchial chambers that each house a labyrinth organ, a complex bony structure lined with thin, highly vascularised respiratory epithelium. The labyrinth organ is a morpho‐physiological adaptation that ...
Betta smaragdina. Ladiges, 1972. Betta smaragdina, commonly known as the emerald green betta, blue betta or Mekong fighting fish (Thai: ปลากัดเขียว or ปลากัดอีสาน) is a species of gourami native to Southeast Asia. The species gets its green and blue colors due to refraction and interference of light ...
Kissing gouramis are open-water egg scatterers; spawning is initiated by the female and takes place under cover of floating vegetation. The eggs, which the adults do not guard, are spherical, smooth, and buoyant. Initial development is rapid: the eggs hatch after one day, and the fry are free-swimming two days thereafter.
The arapaima lays its eggs when water levels are low or beginning to rise. They build a nest about 50 cm (20 in) wide and 15 cm (5.9 in) deep, usually in muddy-bottomed areas. As the water rises, the eggs hatch and the offspring have the flood season from May to August in which to prosper, such that yearly spawning is regulated seasonally.