一群匈牙利水上科学家正在搜索以保存鱼子酱的st鱼卵，意外地创造了这种看起来奇怪的混合动力。一部分美国桨鱼和俄罗斯st鱼，“斯特德鱼”研究本月出现在科学杂志上Genes。
How it happened
该研究的最初目标是鼓励危害濒临灭绝的st鱼无性na繁殖。相反，俄罗斯的st鱼与美国pad鱼杂交，这是两人第一次在被囚禁中成功杂交。
桨鱼最初是为了提供精子而不是其DNA，以帮助st鱼独立繁殖。st鱼在遗传上与pad鱼没有那么不同 - 它们属于同一群体，丙接体式。
作者写道，美国桨鱼与其他st鱼之间的先前杂交尝试没有起作用。而且，由于他们的进化相似性，两者具有截然不同的饲料习惯，首选的栖息地和身体特征。
“此外，两条鱼永远不会自然见面。美国pad鱼居住在密西西比河盆地，俄罗斯st鱼居住在俄罗斯河流中。俄罗斯st鱼被认为对其鸡蛋或鸡蛋非常有价值。
Both species are threatened by shrinking habitats and overfishing. While the caviar that comes from sturgeons is a delicacy, the fish themselves are exceedingly rare in Russian waters.
这就是为什么所有来自匈牙利的研究人员都想鼓励st鱼通过育种生成繁殖的原因，该生成利用另一种物种的治疗精子来哄骗标本的卵发育。但是在妇产发生中，精子标本的DNA不应该转移到后代
杂种接下来可以做什么
There were two types of hybrid fish: One of them is one part paddlefish, two parts sturgeon, and the other is one part paddlefish, four parts sturgeon. Most of them, between 62% to 74%, survived one month after hatching.Both hybrids resembled the sturgeon, with its ridged back and short nose, though one of them did have a pointier snout reminiscent of its paddlefish parent.”The how and why are still open questions,” said lead author Jen? Káldy, an aquaculture researcher at Hungary’s National Agricultural Research and Innovation Centre’s Research Institute for Fisheries and Aquaculture. The two likely hybridized because the sturgeon was slow to evolve. This means there are likely fewer differences between its morphology and genes and those of other species, including, apparently, the American paddlefish.
研究人员说，st鱼杂种通常用于水产养殖中，可提供全球鱼子酱生产的20％。But if the hybrids adopt the paddlefish parents’ habits and learn to feed on plankton and other microscopic organisms instead of the more discerning sturgeon’s diet of crustaceans and larger fare, they may play “an important role in adapting pond aquaculture to the challenges of climate change,” the authors wrote.
Put simply, if these “sturddlefish” end up not needing to be fed and instead can rely on natural plankton in their habitats, the carbon emissions that would’ve resulted from feeding them will shrink. Paired with their high market value, the accidental hybrids could end up being more valuable than their creators imagined.
至于拯救濒临灭绝的st鱼，这项研究“使我们更接近我们的目标”。但是，目前，杂种在匈牙利的一家研究机构和平生活中，在那里没有风险，他们会侵入非本地水域。[CNN]
