Freshwater Fish‎ > ‎Arowana‎ > ‎

Osteoglossum bicirrhosum


Osteoglossum bicirrhosum
Silver Arowana
银龙
The Silver Arowana, Osteoglossum bicirrhosum, sometimes spelled arawana, is a freshwater bony fish of the family Osteoglossidae, commonly kept in aquaria. The term "Osteoglossum" means "bone-tongued" and "bicirrhosum" means "two barbels" (from the Greek language).
This species is found in the Amazon River basin and in the Rupununi and Oyapock Rivers in South America as well as in still waters in Guyana.
This fish has relatively large scales, a long body, and a tapered tail, with the dorsal and anal fins extending all the way to the small caudal fin, with which they are nearly fused. It can grow to a maximum size of 90 centimetres (35 in).Unlike the Black arowana, Silver arowanas have the same coloring throughout their lifespan.
The species is also called monkey fish because of its ability to jump out of the water and capture its prey. It usually swims near the water surface waiting for potential prey. Although specimens have been found with the remains of birds, bats, and snakes in their stomachs, its main diet consists of crustaceans, insects, smaller fishes and other animals that float on the water surface, for which its draw-bridge-like mouth is exclusively adapted for feeding.

银龙分布广从南美圭亚那(Guiana)与巴西的亚马逊河上游到下游。从下流的河口到往上游4000公里的秘鲁(Peru)、依奇多斯(Iquitos)甚至更上游的Maranyun河、乌卡亚力河(Ukayari)的附近,笔者都曾经见过银带 银龙鱼
的踪影。雨季时的大洪水使得亚马逊河各个支流的水位都暴涨,大型鱼都往附近的湖沼地回游分散。虽然各自栖息在独自的环境之中,但本种鱼甚少出现在亚马逊的主流中。支流的水潭及岸边被水淹没的灌木丛,甚至只要有浮草的水上草原都是银带的栖息地。这对稚鱼来说,非但是摄食的好环境,更是躲避潜入水中的鳄鱼、水鸟等掠食者的绝佳处所。是个水质从ph6-7.2的弱酸性软水且混杂着软土的水域,水温从24到28度不等。

银龙拥有十分细长而侧薄的体型。嘴巴的位置位于上方,口裂延伸至眼窝后缘。下噪声较上颚更为突出,前方并排着数个线状的侧线器官。吻端长有一对触须,在自然环境中迦游的野生个体,成鱼的触须可以伸长至3-4cm,但在人工饲育下的个体由于生长受至阻碍往往只能长到1-2cm。下颚的齿骨十分发达,在上下颚间排列地像梳子般的圆锥形齿十分细小且锐利。各齿间的间隔十分狭小。不只前上颚骨,齿骨连口盖的副蝶形骨与舌的构成骨皆十分发达。这是为了要一口咬碎大型甲壳类与甲虫而发展来的。另外,上下颚更注重的是易捕捉猎物的猎捕机能而非其牙齿的咬合力。 银龙鱼
鳃耙发展成棘状。咕噜噜的大眼睛接近上颚前缘,视力十分良好。吻部很短。鼻孔位于两眼的前上方,十分接近吻端。背鳍、臀鳍十分地长,臀鳍的起点比背鳍还要前面些。延伸出去的腹鳍第一棘条甚至超过了臀鳍的起点。胸鳍十分发达。特别是长而有力的第一棘条更是银带藉以跃出水面的利器。这种美妙的飞翔力更使得银带在南美洲当地赢得了“跳跃鱼”(亚马逊“水猴”,夜间易跳缸,故多加防护网。)的美称。体侧覆盖了五列大又美的圆鳞。侧线从头部后鳃盖的后缘上方一直通到尾柄。体高约为体长的五分之一。九十公分左右的五-八岁的公鱼其体高较母鱼来得大上许多。身体中间的部份甚至可以接近两公分。像这样如此有迫力的外型可是再怎么贵的亚洲龙鱼也比不上的。

Max. Size (最大大小) 80-90 cm
pH 6.0 - 7.2
Temp. (水温) 24 - 28 degrees celsius
Water Hardness (水的硬度) 3 - 10 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 - 25 years , (8 - 25年)
   
Sexing
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 Amazon River basin and in the Rupununi and Oyapock Rivers in South America as well as in still waters in Guyana
起源地 南美洲
   
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.
其他鱼类的兼容性/
环境规格
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
每周至少换水20%-30%,氨含量不要超过0.1百万分率(mg/1)。不要使温度、PH值突然变化,如变化突然会导致龙鱼的突然死亡。每周测试PH值和其它有毒物质的含量以遭遇不策。换水时一定要小心谨慎,要避免龙鱼受惊。而且饲养龙鱼的时候一定要避免完全的换成新水,否则会对鱼造成伤害。如果你见到龙鱼的鳍和鳞片脱落的话,就是换水过多造成的你可以暂停换水它们就会自然的复原;但换水量也不可太少,太少会使鱼鳍变得不透明、眼球浑浊严重的会造成腮盖翻转的食欲旺盛,生长迅速,它不受外界气温变化影响,始终维持在一个相对稳定的状态中
   
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
   
Breeding  
繁殖  
   
Disease  
病症  
Comments