Numerous rare fish species face major threats to their survival. Conservation efforts purpose to guard these vulnerable populations and their habitats. 提示：上图数据仅供参考，数据来源为各国或组织官方统计机构。 (使用鼠标滚轮可对数据区域进行缩放) Nowadays, you will find only about twenty – 750 adult European Sea Sturgeons while in the wild. Nevertheless, there are a few thousand fish ... https://share.evernote.com/note/f2fb7718-986d-1649-526a-476a0383185f