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    August 30

    AI

    AI (Artificial Insemination,人工受精),通过人类控制和干预的受精方式,即非自然的动植物受精受孕生殖行为。在黑玛丽(Poecilia Latipinna, Black Molly)的自然繁殖中,由于其采用体内受精,因此无法像胎生鱼类一样,用精子和卵子混合做AI。现在我们采用通过针头或其他管状物,内装雄性玛丽鱼精液,在解剖镜下寻找到雌鱼的生殖腔探入,再将精液吹入。而由于卵胎生鱼类有一次受精多次繁殖的特性,为了确保受精率的准确性,我们要利用处女鱼(virgin fish),这样就能保证雌鱼是被我们手中的精液受孕的。
     
    现在的问题是:生殖孔的位置。针头探入的深度。处女鱼的获得。
     
    在自然受精行为的观察中,很另人吃惊的是,臀鳍向后的雄鱼在交配的刹那,竟然可以将臀鳍向前弯曲,以迅雷不及掩耳盗玲之势扎入雌鱼体内。这是过程是极短的,一眨眼的工夫就可完成,但就可以瞄的那么准,深入的也刚好到位而不至于将精液浪费在水中。当然这都是可以通过训练完成的。最困难的属于硬件条件,即处女鱼的获得。在市场上买的到的一般都是成鱼,联系鱼场,被告知玛丽鱼在处女鱼阶段分辨不出雌雄,这样就对AI和受精率判断有很大困难。我们在想是否可以自己养仔鱼然后自己分辨,因为鱼场工人没时间对待这些小东西,我们自己来一是锻炼自己二也确保没有雄鱼混入,否则混入一条雄鱼混入的话一缸雌鱼都无法保证是处女鱼了。这点在考虑中。
     
    突然想到点什么,补充一下:
     
    剑尾鱼(Xiphophorus)和玛丽鱼在自然界存在变性现象,群体性生活的仔鱼中的雌鱼会进行性逆转,一部分变成雄鱼。另有人提出鱼的性别比例保持在1:1.5~1:2,只是仔鱼阶段性别特征不明显。在研究中表明甲基睾酮会促进仔鱼性逆转,转化率可达100%。而另一份调查表明雌酮、雌二醇或其他人工合成激素可使一些河流中的鱼类雄性雌性化。这样,可不可以用雌激素促进玛丽鱼的雄鱼雌性化...咔咔,这样一来解决处女鱼问题,二来也可以作为新的研究点。不过目前没有玛丽鱼或剑尾鱼雄变雌的报道,具体还要商量和初步实验证明。当然这种实验还是很费时的。不知还来得及不。
     
     
     
     
     

    Comments (2)

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    Viki 肖wrote:
    很有趣,下次要叫我一起玩
    Sept. 6
    哇!好复杂哦!看到我差点晕过去了!
    不过还是学到点知识!
    Aug. 31

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