It eats it
These are factors, human or otherwise, which affect survival of a species.
getting eaten
Global Warming.
no water noy enough food
The answer is poaching
Global warming.
Economic problem and financial forecasts
A shoe, or some other blunt object.
humans poluting water sources, shooting them and pesticides
habitat destruction due to humans. deforestation. hunting for their meat and skin.
As long as piranhas get.