成魚個體壹般在早晨黃昏活動，體長15 ~ 24 cm的個體壹般在黃昏(12: 00 ~ 22: 00)活動，幼魚(8 ~ 11 cm)全天活動。
群居食人魚聽覺高度發達，牙齒異常鋒利。咬住獵物後，緊緊咬住，隨著身體的扭動把肉撕掉。壹口就能咬下16立方厘米的肉。
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