鱼儿攻击鱼缸玻璃反射的"自己"

　　As they swim gently around their tank or bowl, fish tend to enjoy a stress-free existence. But they face one great potential peril, scientists have found.

　　科学家研究发现，当鱼儿在鱼缸中自在游行时不知不觉就面临着潜在的巨大威胁。

　　Apparently, if they catch sight of their reflection gawping back at them, they try to fight it. They are then terrified when their lookalike fights back in exactly the same way.

　　一个明显的发现就是，如果它们借助鱼缸的反射看到了自己的身影，它们会试图和另一个虚拟的自己打架。他们对面的“敌人”当然也会以相同的方式反击他们，因此鱼会感觉更害怕。

　　Scientists say the discovery shows how similar their brains are to ours.

　　科学家们认为，这个发现表明鱼类的大脑和人类极其相似。

　　Biologist Dr Julie, who led the study, said: 'I think this indicates there is more going on cognitively than people have long assumed in fish.'

　　指导这项研究的生物学家朱莉博士说：“我认为这说明鱼类大脑的活动远较人们认为的复杂的多。”

　　All showed high levels of testosterone and other aggression-inducing hormones in their blood.

　　这些攻击行为背后都伴随着他们血液中的睾丸激素和攻击性激素的升高。