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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 .
Betta splendens can be hybridised with B. imbellis, B. mahachaiensis, and B. smaragdina, though with the latter, the fry tend to have low survival rates. In addition to these hybrids within the genus Betta , intergeneric hybridisation of Betta splendens and Macropodus opercularis , the paradise fish, has been reported.
A useful distinction is that, while the generic name Betta is italicized and capitalized, when used as a common name it is usually neither italicized nor capitalized. [5] The common name of B. pugnax, for example, is thus Penang betta. Betta splendens, the Siamese fighting fish, is often referred to simply as a "betta" in the U.S.
The King betta generally grows to about 5–6 cm (2–2 1/2 in). Its pigments are generally vibrant beige to a white. As with most bettas, King betta females are smaller and less colorful than the males. The life span of the King betta is short, generally 2–3 years, rarely reaching four.
Siamese fighting fish (sometimes Betta, esp. US) Betta splendens: 7.5 cm (3.0 in) Betta is the name of the genus that includes more than 60 species other than the Siamese fighting fish. 5 gal [62] 72–82 °F (22–28 °C) [62] 6.5-7.5 [62] Emerald betta: Betta smaragdina: 7 cm (2.8 in) Spotfin betta: Betta macrostoma: 10 cm (3.9 in) Frail ...
Many members are common aquarium fish; by far the most famous is the Siamese fighting fish, Betta splendens (note that the domesticated form is very likely a hybrid). Most (not all) of the 70+ betta species are paternal mouthbrooders; the remaining members of the subfamily are bubblenesters like most osphronemids.
Betta mahachaiensis is a species of bubble-nesting betta native to Thailand, [2] where it occurs naturally near the Gulf of Thailand. It is typically seen in stagnant waters in swamps, pools, and ponds. The species can be found in brackish waters, with salinity levels between 1.1 and 10.6 parts per thousand.
The Krabi mouth-brooding betta is an oblong fish with rounded fins, growing to a length of about 8 cm (3 in). The basic colour is yellowish-brown or greyish-brown with three faint longitudinal stripes. The gill-cover has a bluish-green patch and the fins have a blue iridescence. The pelvic fins are short and the anal fin long, with a dark margin.