Tropical - Fish - Pictures .com

This is a tropical fish site for all tropical fish enthusiasts from beginner to expert. It has some nice tropical fish pictures and will hopefully have something of interest for all freshwater and marine fish keepers. These tropical fish pages provide some information about some of my favourite fish, along with tropical fish pictures of them. I have kept fish for many years now, ranging from community to marine. Over this period I have been drawn towards catfish, and the cichlids, which I must confess, through there antics have become my favourites. I now keep African and American cichlids, along with some catfish and plecs.

 
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Black Piranha

Picture of young Black Piranha
Common nameBlack Piranha, White Piranha
Scientific nameSerrasalmus rhombeus
SynonymsSerrasalmus niger (invalid)
Size16" (40cm)
OriginAmazon basin and Guyana.
Tank setupA large tank with bogwood, possibly a few robust or plastic plants for decor. An adult will require a tank of 100 gallons plus. Heavy-duty filtration is essential. Dim lighting.
CompatibilityA highly predatory and aggressive carnivore, keep alone.
Temperature24-27oC (75-81oF)
Water chemistryFairly soft, acidic water (pH 5.8-6.8) prefered, but not essential.
FeedingCarnivore: Live or dead meaty foods. There is no particular need to feed live fish, as they can usually be weaned onto thawed mussel, prawn, whitebait, etc. Earthworms may be useful with reluctant feeders. The use of "feeder fish" carries a strong risk of introducing disease.
SexingThe anal fin of the male is extended at the front, on females it is straight.
BreedingEggs are laid among plants or in a pit in the substrate and defended by the parents. Hatching takes around 2-3 days.
CommentsThe piranha are infamous as highly dangerous carnivores. This reputation is somewhat exaggerated, but it is wise to take precautions when carrying out tank maintenance, as they can inflict nasty bites. The fish may actually appear rather timid if kept in a brightly lit aquarium with little cover.
There has been a lot of confusion about this species in the past. This results partly from the change in colouration as the fish matures (see photos). Young specimens are lighter in colour, and often referred to as the white piranha. Based on adult specimens, the fish was described as a different species and assigned the name S. niger. However, this name is not considered valid due to the pre-existance of the name S. rhombeus. However, the exact relationship of the white and black piranhas, i.e. the existence of different species, subspecies, or regional variants of the same species, has probably not been definitively established.


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