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Scleropages jardini

Scleropages jardini
Pearl Arowana
The Pearl Arowana, Scleropages jardinii, is a freshwater bony fish native to Australia and New Guinea, one of two species of fishes sometimes known as Australian arowanas, the other being the saratoga (S. leichardti). It has numerous other common names, including northern saratoga, Australian bonytongue, toga and barramundi (not to be confused with the barramundi perch, Lates calcarifer). It is a member of the subfamily Osteoglossinae, a (basal) teleost group. Its scientific name is sometimes spelled S. jardini.
This fish has a long, dark-colored body with seven rows of large scales, each with several reddish or pinkish spots arranged in a crescent shape around the trailing edge of the scale, giving it a pearly appearance. Its has large, wing-like pectoral fins. Except for duller coloration and smaller scale size, it appears very similar to the Asian arowana, S. formosus. It grows to a length of about 90 cm. Its maximum weight is recorded as 17 kg. The depth of the bodies of adults is approximately 25-28% of the Standard Length, making this a more robust fish than its Australian cousin S. leichardti. mthey can be easily distinguished from the Asian arowanas by identifying their red spotted fins & 7-8 rows of scales on their body.

珍珠龙和银龙鱼不同的是有七行鳞片,鳞片的边和里面颜色不同,如同身上有一个个小珍珠闪亮。珍珠龙又称澳洲龙,珍珠龙原产地在澳洲。此品种是非常强壮的,体型较小、修长,鳞片中央、尾鳍、背鳍、腹鳍有红色的斑点,有的鳞框为红边,侧线有35鳞片,臀鳍梗骨有31支,尾鳍梗骨有21支,胡须既短又小,生性好斗,常导致胡须断裂。 卵粒直径约1公分,每次产卵50~200粒。身体为 淡褐色,龙须为黑色且柔软短小;幼鱼呈现出银白色的色泽,背部为铜褐色, 且背部有些弯曲;成鱼时尾部有明显的红色喷点,鳞片则为浅蓝底浅红色的环 纹,如果从幼鱼便喂食增红的饵料,则会有尾鳍红色斑点,此种的龙鱼性情略显凶爆,饥饿时,会寻找可吃的鱼,包括体形较大的鱼

Max. Size (最大大小) 80-90 cm
pH 6.5 - 7.5
Temp. (水温) 24 - 28 degrees celsius
Water Hardness (水的硬度) 6 - 16 dH
Salinity (盐度)  
Stocking Ratio (放养比例) 1 Male:1 Female, (1雄:1雌)
Diet (饮食) Carnivore (肉食性)
Life Span (寿命) 8 - 12 years , (8 - 12年)
Arowanas are hard to sex, especially when they are young. Generally, males are larger in size and fins then its female siblings which give then a more errogant look. They also has wider and deeper jaw(to hold the eggs and fries). Females, on the other hand is smaller in size and has a more rounded body. It takes a lot of experience to sex mature asian arowana, leave alone the youngs. Even then, only when they started breeding, then you can be 100% sure which one is male and which is female.
Time taken for arowana to mature depends on the condition they are growing in. The better why are care of, the earlier they will reach maturity. Generally female takes 2-3 years and male 4-5 years to reach maturity
性别鉴定 雄性龙鱼口腔似乎较大,可能为日后育苗做准备。另外,胸鳍和而呈深红色,且鱼体本身便略瘦长于母鱼,这一点,由鱼池上方观察便可轻易地发觉。另外,雌性龙鱼身材总较公鱼肥短,而且腹部较易有膨胀之感,胸鳍与头部色泽,较不如公鱼来得深。
Origin Northern Australia, New Guinea
澳洲, 新畿内亚
Tank Compatibility/
Environment Specifications
Do not keep with smaller fish as they will be mistaken as prey. Keep with larger fish such as Tinfoil Barbs, Giant Gourami, large Catfish,Stingrays, Siamese Tigers, myleus schomburgkii, semaprochilodus taeniurus
A laterally long tank is a must for this fish, width is more important than depth, the Silver Arowana must have room to turn around as it's not very flexible! A secure lid is a must as the Silver Arowana is purely top-dwelling and can jump. If this fish is kept in a tank too small for it and it's not able to turn around it may suffer from "gill curl", where the gill plates curl outwards and will cause the fish to have to swim backwards in order to breathe properly and susceptible to gill infections.
不适合和体形小的鱼类养在一起 适合体形较大的鱼例如 魟鱼, 飞凤 , 泰国虎 或者粗线银版

Diet/Feeding Regime Crickets, Centipedes, Live Fishes, Fish Meat, Live Prawns/shrimps, Krill, Bloodworms Tubifex, Worms, Mealworms, Earthworms, Frogs。 Small Arowana (below 6 inches) should be fed three times a day, medium Arowana (6 inches to 14 inches) twice a day and large Arowana (above 14 inches) once a day or alternate day. Variety in food is important to avoid nutritional deficiency. High fat food like feeder fish should only be used sparingly to avoid drop eye problem. If arowana is overfed for a long period of time, it may lost its appetite and starve itself for a periods of a few days. Overfeeding can also shorten the lifespan of Arowana and affect its breeding capability.
饮食饲喂制度 蟋蟀,蜈蚣,活鱼,鱼肉,活跳虾/虾,磷虾,血虫蚓,蠕虫,Mealworms,蚯蚓,青蛙. 小鱼每天两到三次. 中鱼每天两次,大鱼每天一次