Overall, Rountree auditioned 129 piranhas, of four different species.

朗特里一共录制了4个不同种类的129只水虎鱼的声音。

Because Rountree studies the sounds fish make.

因为朗特里研究的是鱼类发出的声音。

Six years ago, the fish ecologist Rodney Rountree was on a skiff in the Peruvian Amazon.

六年前，鱼类生态学家罗德尼·朗特里乘坐小艇航行在秘鲁亚马逊河上。

Rountree also recorded 10 hours of underwater soundscapes, like this one, captured during a piranha feeding frenzy.

朗特里还录制了10个小时的水下环境音，比如这段水虎鱼疯狂捕食时的录音。

And then Rountree would hold it underwater, near a hydrophone, to capture the sounds it made.

之后，朗特里将鱼放在水中接近水听器的位置，录制鱼发出的声音。