Freshwater Fish‎ > ‎Danio‎ > ‎

Danio rerio

Danio rerio
Zebra Danio

Zebra Danio

Long Fin Zebra Danio
Golden Zebra Danio

Long Fin Golden Zebra Danio

Leopard Danio

Long Fin Leopard Danio

The zebrafish, Danio rerio, is a tropical freshwater fish belonging to the minnow family (Cyprinidae) of order Cypriniformes. It is a popular aquarium fish, frequently sold under the trade name zebra danio, and is an important vertebrate model organism in scientific research.
The zebrafish are Cyprinidae with a derived member of the genus Danio. It has a sister group relationship with Danio kyathit.
Zebrafish are closely related to the genus Devario, as demonstrated by a phylogenetic tree of close species
The zebrafish is native to the streams of the southeastern Himalayan region, including the countries India, Pakistan, Bangladesh, Nepal, and Myanmar. It arose in the Ganges region in Eastern India. It commonly inhabits streams, canals, ditches, ponds, and slow-moving to stagnant water bodies, including rice fields.
The fish is named for the five uniform, pigmented, horizontal blue stripes on the side of the body, all of which extend to the end of the caudal fin. Its shape is fusiform and laterally compressed, with its mouth directed upwards. Males are torpedo-shaped and have gold stripes between the blue stripes; females have a larger, whitish belly and have silver stripes instead of gold. Adult females will exhibit a small genital papilla in front of the anal fin origin. The zebrafish can grow to 6.5 centimetres, although it is uncommon for them to grow past 4 cm in captivity. Life-span in captivity is around 2–3 years, although in ideal conditions, may extend to 5 years.
The approximate generation time for the Danio is 3–4 months. A male must be present for ovulation and spawning to occur. Females are able to spawn at intervals of 2–3 days, laying hundreds of eggs in each clutch. Upon release, embryonic development begins; absent sperm, growth stops after the first few cell divisions. Fertilized eggs almost immediately become transparent, a characteristic that makes D. rerio a convenient research model species. Development progresses rapidly. Precursors to all major organs appear within 36 hours of fertilization. Hatching takes place 48–72 hours after fertilization, depending on the embryo's internal conditions and the external temperature, ideally 28.5 °C. Swimming and feeding behavior begin about 36 hours later. The sex of juveniles cannot be distinguished except by dissection, and sex determinants are not clearly understood.
The zebrafish is omnivorous. It primarily eats zooplankton, insects and insect larvae, and phytoplankton. It can eat a variety of other foods, such as worms and small crustaceans if its preferred sources are not readily available. Most Danios accept common food flakes and tubifex worms in the aquarium.
Zebrafish are hardy fish and considered good for beginner aquarists. Their ease of keeping and breeding, beauty, price, playful nature and broad availability all contribute to their popularity. They thrive best in 22–28 °C  water. They need an aquarium of 10 US gallons (38 L) or more, and they do well in schools. They also thrive as shoals of six or more, and interact well with other fish types in the aquarium. However, they are susceptible to Oodinium or velvet disease, microsporidia (Pseudoloma neurophilia), and Mycobacterium species. Given the opportunity, adults eat hatchlings, which may be protected by separating the two groups with a net, breeding box or separate tank.

斑马鱼(zebra fish),又名蓝条鱼、花条鱼、斑马担尼鱼(Brachydanio rerio),原产于印度、孟加拉国。 斑马鱼(B. rerio),是淡水水族箱观赏鱼,原产於亚洲,体长约5-6分,具暗蓝与银色纵条纹,蓑鮋属鱼类是海水水族箱观赏鱼,鳍棘有剧毒,体具色彩丰富的垂直条纹。有些种类称为蓑鮋(lion-fish)或称狮子鱼、火鸡鱼。由于其基因与人类87%相似,因此广泛应用与生命科学的研究,2009年研究表面,它可能为盲人和耳聋带来福音 斑马鱼斑马鱼(zebra fish),又名蓝条鱼、花条鱼、斑马担尼
  鱼(Brachydanio rerio),原产于印度、孟加拉国。(里面常见的蓝斑马讲解)是两个非近缘鱼类类群,即鲤形目(Cypriniformes)鲤科(Cyprinidae)短鱼丹属(Brachydanio)淡水鱼类和鮋形目(Scorpaeniformes)鮋科(Scorpaenidae)蓑鮋属(Pterois)海水鱼类的统称。斑马鱼(B. rerio),是淡水水族箱观赏鱼,原产於亚洲,体长约4公分(1.5吋),具暗蓝与银色纵条纹,蓑鮋属鱼类是海水水族箱观赏鱼,鳍棘有剧毒,体具色彩丰富的垂直条纹。有些种类称为蓑鮋(lion-fish)或称狮子鱼、火鸡鱼。斑马鱼是一种常见的热带鱼。斑马鱼体型纤细,成体长3-4cm,对水质要求不高。孵出后约3个月达到性成熟,成熟鱼每隔几天可产卵一次。卵子体外受精,体外发育,胚胎发育同步且速度快,胚体透明。发育温度要求在25-31℃之间。斑马鱼由于个体小,养殖花费少,能大规模繁育,且具许多优点,吸引了众多研究者的注意。经过30多年的研究应用和系统发展,已有约20个斑马鱼品系,斑马鱼基因数据库里有相关的资料可供查询和下载,方便了研究。斑马鱼的细胞标记技术、组织移植技术、突变技术、单倍体育种技术、转基因技术、基因活性抑制技术等已经成熟,且有数以千计的斑马鱼胚胎突变体,是研究胚胎发育分子机制的优良资源,有的还可做为人类疾病模型。斑马鱼已经成为最受重视的脊椎动物发育生物学模式之一,在其它学科上的利用也显示很大的潜力. 体长5~6厘米。体呈纺锤形。背部橄榄色,体侧从鳃盖后直伸到尾未有数条银蓝色纵纹,臀鳍部也有与体色相似的纵纹,尾鳍长而呈叉形。雄鱼柠檬色纵纹;雌鱼的蓝色纵纹加银灰色纵纹。