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鱼类也有"阴茎":用鱼类"色情片"研究雌鱼对雄鱼偏好

 6 years ago
source link: http://tech.sina.com.cn/d/a/2017-12-12/doc-ifypnqvn3354934.shtml
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新浪科技讯北京时间12月12日消息,据国外媒体报道,在繁殖问题上,大多数鱼类都是体外受精,即雄鱼和雌鱼分别将精子和卵子排到水中,让它们自然结合。不过,剑尾鱼属(Xiphophorus)鱼类与大部分鱼类不同,它们是在体内受精,并能“生出”活的

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