Armand;3097568; said:
Hi.
I corrected your presentation.
This way is better although i don't think your english is so bad.
Take a look:
My presentation is about piranhas. As you probably don’t know, piranhas are now a days available in most of the fish shops all over.
Everyday an increasing number of people are buying those fish. One of the main reasons for this to happen is that people think this fish are bloodthirsy beast which devour everything that hits the water, so, for most of such people it could be cool to keep such interesting spicies in their homes. But is it fact true?
First we will see the main species of piranhas, and then we will see if they are real regarding they fame as vicious killers. bloodthirsty monsters, and we will try to explain from what does it come
I) Presentation of piranhas
The most famous species is the pygocentrus. This species is gregarious which means that they live in groups that may even be composed by hundreds of individuals. This species regroup some sub-species like the famous pygocentrus natereri more known under the name: red belly, also there are other sub-species like pygocentrus caribe, and pygocentrus piraya. This species could represent a danger to humans.
The second species is the serrasalmus, unlike the pygocentrus, this species is most of time solitaire and regroups differents sub-species like: serrasalmus rhombeus, serrasalmus elongatus, serrasalmus sanchezi. And just some of thiese sub-spicies could be potentially dangerous to humans.
We found them in South America, in most of rivers but more particularly in the Amazon River.
II) Bloodthirsty monsters?
All of us have read or seen books or films which show the piranhas as monsters which devour everything. First you must know that there has been only one deadly attack to humans. It was in 1870, during the war between the Brazil and the Paraguay.
Some injured soldier tried to cross the Rio Paraguay, and they were eaten. But no other attack to humas has been registered or known about. Despìte of what is believed piranhas are bad hunters and prefer getting preys that are easy to catch like wounded, ill or dead animals, that is why that attack to wounded humans that turned out to be eaten by piranhas.
You must know that piranhas are in fact not really feared for the tribes in south America, there are a lot of species that are in fact more dangerous and fearsome like caimans, poisonous rays and snakes, electric eels and so.
III) Where does this legend come from?
It is really hard to answer this question, but at some point in the past, when the first europeans expored southamerica they must have heard of seen that piranha, if given the conditions, are capable to reduce an animal of a considerable size to the bones in a matter of minutes then somebody could have exagerated this fact and the myth about rivers infested with carnivorous fish capable to reduce a human to the bones in seconds started to pass from mouth to mouth throughout the years.
The image of piranha has become an icon of southamerica wilderness and adventure:
For example in the past an adventurer that went to africa had to face a and kill a lion if he wanted to be seen as a great, brave and bold adventurer.
In the case that adventurer went to South America, he had to cross a river infested of dangerous piranhas to match the african adventure.
At least it is the way some books and hollywood has shown us this.
Then in this way the literature and movies have used and increased the idea of this myth by presenting piranhas like dangerous killers by making horror films where the monsters were the piranhas and also fish sellers take advantage of this myth in order to sell them easily, at good prices and earn good money.
Good luck and Cheers.
Armands version is better, but maybe I can give you the native english speaker version. I've completed all my college english requirements, and written dozens of papers. Here we go:
PIRANHAS
Piranhas are an increasingly popular part of the aquarium industry. As you may already know, piranhas are now available in most fish shops. More and more people are buying these fish to keep as pets. This increased interest in piranhas is due largely to a common misconception concerning the behavior of piranhas. When most people think of piranhas, they imagine a beast which devours everything that hits the water, but is this reputation for viciousness well deserved?
First we will discuss the species of piranha most commonly kept as pets. Then we will determine if they are truly bloodthirsty monsters, and if so, we will try to explain the reasons for this viciousness.
I) Presentation of piranhas
The most famous genus is Pygocentrus. This species is gregarious which means that they live in groups composed of hundreds of individuals known as a shoal. Piranha belonging to this genus include the infamous "red belly piranha," also known by the scientific name
Pygocentrus nattereri. In addition, there are other species of piranhas in the genus pygocentrus. The other two pygocentrus species are
Pygocentrus cariba, and
Pygocentrus piraya. Only these three species are considered "true" piranhas.
The second most common genus is serrasalmus, unlike the pygocentrus, this genus is mostly solitary and includes many species. The most commonly available serrasalmus species are:
Serrasalmus rhombeus,
Serrasalmus elongatus,
serrasalmus sanchezi. Due to their solitary behavior, these species are not considered dangerous to humans, but in the wild grow to sizes of nearly two feet in length and brandish sharp teeth capable of delivering serious injuries if provoked.
All piranha species are native to the Amazon River basin in South America.
II) Bloodthirsty monsters?
We are all familiar with the legends surrounding piranhas. First you must know that there was only one deadly attack on a human. This attack occurred in 1870, during the war between Brazil and Paraguay. Injured soldiers crossing the Rio Paraguay were eaten. There is no record of other attacks where humans were killed by piranhas. Piranhas are primarily scavengers, and many stories of them devouring humans is due to the discovery of human remains stripped of flesh by shoals of piranha. It is widely believed that piranhas will only devour human remains if the human is already deceased before entering the water. Most likely, the soldiers who were attacked crossing the Rio Paraquay were attacked because their wounds were oozing blood into the river. Blood oozing into the Amazon is like a dinner bell for piranhas. They are drawn to the smell. Piranhas primarily serve as the Amazon River's clean up crew. They remove the remains of deceased animals. It is important to keep in mind that the tribes living along the Amazon do not fear the piranha. The Amazon is home to far more dangerous predators which the natives must be ever vigilant against. These include jaguars, cayman alligators, anaconda, poisonous rays, and electric eels.
III) Where does this legend come from?
It's hard to say for sure how this legend began, but people visiting South America from Europe and North America saw piranhas, and when they returned to Europe, it was more glorious to claim that piranhas are true killers rather than a simple fish. For example an African adventurer may contend with lions, but a South America adventurer has to cross river after river infested with starving piranhas.
These inaccuracies lead to the idea that most people have of piranhas today. By presenting piranhas as dangerous killers in cinema, TV, and books this myth has continued to grow despite overwhelming scientific evidence to the contrary. Perhaps worst of all, many fish dealers continue to promote this myth concerning piranhas because it increases the sales of the fish. People are interested in keeping a bloodthirsty predator, but there is no fish that displays the kind of predatory behavior normally attributed to piranhas.
Oh yeah and FYI you should look up former american president Teddy Roosevelt and piranhas. He is largely responsible for telling North AMericans about piranhas. RBP's were even orginally named Serrasalmo rooseveltia. He told everybody they were bloodthirsty killers and it stuck.
I would add a conclusion, but hey it's not my paper. I hope this helps. Your english is not all that bad, just some problems with subject-verb agreement, and tense usage. I promise I've gotten an A in every english class I have taken in the last 20 or so years.
