幼鱼特征：

*狭长的身形

*大而橘红的眼睛

*体侧的虎纹

*体侧的绿色色调

成鱼特征：

*类似P属形状的头型

*体侧呈现银色

*黑色的V形尾鳍

饲育水槽：

辛古水虎在饲育方式正确的水族箱中是十分强健的，要求PH值6.0，温度76F～80F（不知道摄氏和华氏的换算）。摄食上不太挑剔，几乎会吃下所有给予的饵食。

侵略性：

辛古水虎是最具侵略性的水虎品种之一，它们具有极强的领域性，不容许缸中任何其他鱼种的存在，所以必须单独饲养。同时辛古水虎会始终警惕周遭环境并会立刻对任何放入水中的物体发动攻击。

食物：

此种类在食物要求上与其他大部分水虎一样，鱼、虾、磷虾、介虫、蠕虫和其他昆虫皆可。同时，坚果、种子和水果也是其野外生存中的重要食物来源。

英文原文：Jonas Hansel     取自：www.aquascapeonline.com

以下附上原文：

Manuelli Piranha 4" (Serrasalmus Manuelli)
Maximum Size:
Being one of the largest species of piranha known to man, according to South American natives and fishermen, this fish have reportedly been caught at sizes well over 20" (50 cm.). So far, there's little evidence available to back up these claims.
In home aquariums, this fish is a very rare sight, and most fish that have survived the ordeals of shipping are below 8" (this species is notoriously vulnerable during transport, and therefore this species is very exotic and expensive). The largest specimen in captivity are about 13-14" in size, so not even close to their full growth potential.

Body Characteristics:
Juvenile S. manueli are easily recognizable, because they have a number of traits that set them apart from most other species: first of all, their body shape is very elongated, making them fast and agile swimmers. Besides that, thet have a concave headshape, a very long lower jaw, extremely large eyes, and vertical bands running over their greenish tinted flanks (giving young specimen the name Green Tiger Piranha).
When they grow up, the body shape becomes more stocky and high, the bands on the flanks start to disappear, as well as the greenish hue on the flanks. The head shape becomes more convex (more resembling pygocentrus species).
All specimen, juvenile and adult alike (most likely except fry and very small specimen), have red or orange gill plates and a prominent, dark humeral spot. The eye color is orange.

Distinctive/unique features:
As juvenile:
Very elongated body.
Large, orange eyes.
Tiger stripes on flanks.
Green hue on flanks.

As adult:
Pygocentrus-like headshape.
Flanks silver colored.
Black, V-shaped tail fin coloration.

Aquarium - The Manuelli Piranha is very hardy and does well in the aquarium provided its given the right conditions.  It Requires a PH of 6.0 and a temperature of 76f to 80f.  Its not a picky eater and will consume just about every thing that is offered to them.

Aggression - The Manuelli piranha is one of the most aggressive piranhas.  They are super aggressive and will not tolerate any other fish in the tank, they must be kept by them selves.  The Manuelli Piranha is always aware of everything that is going on and will attack anything you put in the tank as soon as it hits the water.

Food:
This species accepts the same foods as most other piranha's: fish (fresh fillets, frozen fish, live feeders), shrimp, krill and other crustaceans, worms and other insects. Also, nuts, seeds and fruits might be accepted, because they form a substancial part of their diet in the wild.

By:Jonas Hansel