当金鱼准备产卵,就表示它怀孕了。金鱼是否怀孕是有迹可寻的。首先,判断金鱼是否具备怀孕的条件。其次,判断雌鱼和雄鱼是否都有“产卵前期”行为。只有雌鱼和雄鱼同缸,雌鱼才有可能怀孕。不排除你买回来的金鱼本来就有身孕,不过这个概率很低。
步骤
部分
1
部分 1 的 2:
查看金鱼是否具备怀孕的条件
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1
查看金鱼是否是雌鱼。要想知道金鱼的性别,最好的办法就是买金鱼的时候问问老板,或者请教兽医。通常来说,雌鱼的体态更丰腴。仔细一看,你还会发现雌鱼腹部更丰满,而雄鱼腹部更纤细。雌鱼位于腮后的胸鳍比雄鱼的更短,形状更圆。[1]
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2
考虑时节。养在户外的金鱼只在春或初夏产卵。养在室内的金鱼一年四季都有可能产卵。要判断养在户外的金鱼是否怀孕,可以看看当前是什么时节。[2]
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3
查看水温。水温20度时,金鱼最有可能怀孕。因此,要判断金鱼是否怀孕,可以查看当前的水温是否适宜它怀孕。[3]
部分
2
部分 2 的 2:
查看金鱼是否有“产卵前期”行为
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1
查看雄鱼身上是否有产卵结节。当雄鱼具备使雌鱼受孕的能力时,它的头、鳃盖和胸鳍周围会长出一些极小的白色凸点,被称为“产卵结节”。要是雄鱼有产卵疣粒,那么同缸的雌鱼怀孕的可能性就更大了。[4]
- 产卵结节通常很难被发现。要是没发现,也不代表鱼没怀孕。
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2
留意雄鱼是否追逐雌鱼。当金鱼准备产卵时,雄鱼经常追逐雌鱼,像共舞一样,被称为“求偶追逐”。通常,求偶追逐比产卵结节更容易被观察到。[5]
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3
留意金鱼是否活跃。金鱼怀孕时通常会变得行动迟缓。倘若鱼游得慢或貌似行动困难,有可能怀孕了。[6]
- 倘若金鱼出现“筑巢”行为,或者总躲在遮蔽物和植物旁,有可能是怀孕了。
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4
留意金鱼是否厌食。金鱼准备产卵时可能会厌食。要是金鱼吃得比平常少,有可能不久就要产卵了。[7]
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5
留意金鱼的体型。雌鱼的身体通常比雄鱼圆润一些。金鱼准备产卵时,它的腹部会圆鼓鼓地突出来,比平常大很多。[8]
- 与产卵结节同样的道理,肚子变大这种变化在某些品种的金鱼身上会很明显,而在一些品种的金鱼身上根本看不出来。