That information I got from a fish hatchery employee. Added the part about a massive amount of space though, I guess I got a little carried away. Also I lived in Peru for three years. I know where these fish live, pirahnas have the whole amazon river to swim in. They usuallly live on the edges of the river with no or little current. They taste horrible and they will not attack you if you swim in the water, only if you lie very still at the surface.
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