Freshwater Fish‎ > ‎Arowana‎ > ‎

Osteoglossum ferreirai


Osteoglossum ferreirai
Black Arowana
黑龙
The Black Arowana, Its natural habitat are the still waters of the Negro River basin (Brazil and Colombia) and the upper Essequibo River basin (Guyana) in South America.
It has a long body and a tapered tail and can grow to a maximum size of 90 centimetres. The juveniles are black with yellow markings down the length of the body, head and the tail. Once it reaches about 15 cm, the markings will disappear and it will start to obtain a dark irridecient steel grey to blue coloration, hence its common name. Additionally, there is a bright yellow and a red outlining or the dorsal, caudal and tail fins
The species is also called water monkey or the monkey fish, because it can literally jump out of the water and capture its prey. It usually swims near the water surface awaiting for potential prey. Although it has been known to eat larger prey like small bats and birds and even small monkeys, their main diets consist of shrimps, insects, smaller fishes and other animals that float on the water surface, on which its draw-bridge-like mouth is exclusively adapted for feeding.

分布于南美洲亚马逊河内的尼格罗河内,其体形与银龙相似,呈扁平修长形,幼鱼时体色呈黄色,并有一条黄色的横线从头一直延伸到尾部,当渐渐长大时鱼鳍会变成深蓝色、甚至黑色紫色等暗的色彩。黑带比较神经质,且体质也较虚弱,需要细心照顾。   此鱼于1966年于尼格罗河(Rio Negro)发现;体型和银带相似,不同点为幼鱼时期,身上略带黑色,成长后黑色渐褪,鳞片转呈银色,各鳍均会变深蓝色,至超大型时会趋向黑色,带紫色、青色。此种鱼容易受惊吓,目前在巴西也受到保护

Max. Size (最大大小) 80-90 cm
pH 6.5 - 7.5
Temp. (水温) 24 - 30 degrees celsius
Water Hardness (水的硬度) 8 - 18 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) 12 - 25 years , (12 - 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 Negro River basin (Brazil and Colombia) and the upper Essequibo River basin (Guyana) in South America
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