最近瑞典有漁民喺當地海岸，捕獲一種叫「Pacu」嘅淡水魚。佢哋擁有類似人類嘅牙齒，最長可達90公分，主要分布喺南美洲亞馬遜河。Pacu有另外一個花名叫「Ball Cutter」，佢哋有個咁嘅名，係因為佢哋會習慣會一口咬落男性泳客睪丸，之前已發生過類似意外。海洋學家指喺瑞典搵到Pacu屬唔尋常嘅現象，反映生態問題惡化。

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