Pleochroism is an optical phenomenon in which a substance has different colors when observed at different angles, especially with polarized light.
The giant danio is a tropical fish belonging to the minnow family Cyprinidae. Originating in Sri Lanka, Nepal, and the west coast of India, this species grows to a maximum length of 4 inches (10 cm), making it one of the largest of the danionins. It is characterized by a blue and yellow, torpedo-shaped body with gray and clear fins.
The pearl danio is a tropical fish belonging to the minnow family Cyprinidae. Originating in Sumatra, Myanmar, and Thailand, this fish is sometimes found in aquariums by fish-keeping hobbyists. It grows to a maximum length of 2.6 inches (6.5 cm) and lives for around five years. The fish could have a brownish-yellow, pink, or a silver body and two light yellow/white or blue/red stripes. It has an iridescent look. The female fish has two pairs of barbels.
The blue danio or Kerr's danio,Turquoise danio is a tropical fish belonging to the genus Danio in family Cyprinidae.
Bandipur National Park established in 1974 as a tiger reserve under Project Tiger, is a national park located in the Indian state of Karnataka, which is the state with the highest tiger population in India. It is one of the premier Tiger Reserves in the country along with the adjoining Nagarhole national park. It was once a private hunting reserve for the Maharaja of the Kingdom of Mysore but has now been upgraded to Bandipur Tiger Reserve. Bandipur is known for its wildlife and has many types of biomes, but dry deciduous forest is dominant.
The glowlight danio is a small, schooling fish closely related to the popular zebrafish Danio rerio. This should not be confused with the GloFish, a trademarked brand of fluorescent zebrafish that appear to glow in the dark under ultraviolet light. Danio choprae is an active danionin species that spends most of its time on mid-water levels. This species feeds on insects that have fallen into the water, aquatic insect larvae, and other small animals. In the aquarium, it accepts most foods offered, including most dry foods. It has a streamlined body marked with a brilliant orange longitudinal band and a series of vertical blue-black bars on the flanks. The fins are edged with yellow. In recent years, it has become quite widely traded as an aquarium fish, but otherwise has no commercial importance. Its common name derives from its similarity to the glowlight tetra, a South American characin only distantly related to this fish. They get on well with all other Danio species except the giant danio.
The fire bar danio, Maetaeng danio, or tiger danio, is a small freshwater fish in the minnow family found in the Ping River basin. Its description includes:
The rose danio is a tropical fish of the family Cyprinidae. At first glance, this species resembles the pearl danio, but lacks the orange stripe on the side. It has a rosy colouration along the lower part of the fish and lower fins and gleams purple-blue in sunlight. It is also commonly known as the purple passion danio. Its natural range includes the Mekong River drainage in China, Thailand. Laos, and Myanmar.
The redfin danio resembles a zebra danio with blood-red fins. It may be a colour morph of the orange-finned zebra danio, Danio kyathit.
Danio is a genus of small freshwater fish in the family Cyprinidae found in South and Southeast Asia, commonly kept in aquaria. They are generally characterised by a pattern of horizontal stripes, rows of spots or vertical bars. Some species have two pairs of long barbels. Species of this genus consume various small aquatic insects, crustaceans and worms.
The common name for the fish fire ring danio is given by the aquatics trade to the following species of Danio:
The Indian flying barb, historically flying barb, is one of the species known in the group flying barbs owing to their extremely long barbels. It was discovered as long ago as 1822 by Hamilton. However, it is rarely seen in aquaria. It is found in Myanmar, Nepal, Pakistan, Sri Lanka and India, it is found in many of the same localities as Danio rerio and Danio dangila, an example being the Jorai Rivulet, a tributary of the Sankosh river in Coochbehar district, West Bengal, India. The rare fish Borellius spp. is locally named "Boirali maach".
Boehlkea fredcochui, also known as the Cochu's blue tetra is a species of characin. Its natural range is in the Amazon Basin. It is commonly kept as an aquarium fish. This species has most likely not been seen in the hobby for many years.
Danio tinwini, commonly called gold-ring danio, is a newly discovered species of Danio from Myanmar. It is also referred to as Danio sp. "TW02". It is a tiny gold fish whose body and fins are covered with blue spots. It has also been referred to as Danio sp "Ringlet" or Danio sp "Blue Ring". It has been described by Kullander and Fang, based on collection by Mr U Tin Win, hence its species name. It is known only from the Mogaung Chaung, Myitkyina District, Kachin State, northern Myanmar. This is a tributary of the Irrawaddy River.
The danionins are a group of small minnow-type fish belonging to the family Cyprinidae. Members of this group are mostly in the genera Danio, Devario and Rasbora. They are primarily native to the fresh waters of South and Southeast Asia, with fewer species in Africa. Many species are brightly coloured and are available as aquarium fish worldwide. Danio species tend to have horizontal stripes, rows of spots, or vertical bars, and often have long barbels. Devario species tend to have vertical or horizontal bars, and short rudimentary barbels, if barbels are present at all. All danionins are egg scatterers and breed in the rainy season in the wild. They are carnivores living on insects and small crustaceans.
