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Most certainly not. A jellyfish is a creature belonging to the phylum Cnidaria, a zoological category of aquatic animals known as coelenterates or cnidarians, which also includes corals and sea anemones.
肯定不是魚！水母是一種刺胞動物， 是一種水生動物的門類， 叫做腔腸動物或是刺細胞動物。 珊瑚和和海葵也屬於這類動物。
Jellyfish live in water, and have bell- or saucer-shaped bodies made of a jelly-like substance, which is often transparent or semi-transparent. Around the edge of the body are stinging tentacles, which the jellyfish uses to catch its prey and which can also cause painful injuries to swimmers if they come into contact with them.
水母生活在水裡， 身體呈鈴狀或碟狀， 主要由膠狀物組成， 往往是透明或半透明的。 身體的邊緣， 長有刺狀的觸鬚， 主要用來捕獵。 如果有人跟它們發生碰觸， 水母會用觸鬚攻擊， 導致刺痛受傷。
One of the main differences between jellyfish and fish is that, while fish are vertebrates, having a backbone, all coelenterates are invertebrates. Jellyfish don't have a skeleton, a brain, or a central nervous system, and unlike fish, they reproduce both sexually and asexually at different stages of their life cycle.
水母和魚之間的主要區別之一在於：魚是脊椎動物， 有脊骨；而所有的腔腸動物都是無脊椎動物。 水母沒有骨骼， 也沒有大腦或是中樞神經系統。
Typically, a jellyfish goes through four main phases of development: planula, polyp, ephyra, and medusa. A jellyfish looks very different when it's in the earlier stages of its life cycle: it's the later, medusa form that we think of when we call a typical jellyfish to mind. A jellyfish begins as a planula, a larval stage, having a flattened, solid body. The next phase is a polyp, which can reproduce asexually, a process known as budding. An ephyra (a small medusa) is also produced asexually, from a polyp. The ephyra then matures into the medusa stage, which can reproduce sexually, from an egg of one individual and a sperm of another.
一般來說， 水母會經歷四個主要的生命發展階段：浮浪幼體階段、水螅階段、蝶狀幼體階段和成體階段。 水母在生命的早期階段， 看起來與我們說到水母時所想到的成體水母， 完全不一樣。 在浮浪幼體階段時， 水母尚處於幼體階段， 身體扁平而堅實。 下一個階段是水螅階段， 這時水母可以進行無性繁殖， 這個過程被稱為budding（萌芽階段）。 碟狀幼體階段的水母也進行無性繁殖， 直接從浮浪幼體發育而來。 碟狀幼體成熟之後， 就成了成體水母， 此時進行的是有性繁殖， 即來自不同水母的卵子和精子相結合，
The confusion between fish and jellyfish probably comes from the name that they share and the fact that they both live in water, but that, essentially, is where the similarities end.
水母到底是否是魚類的困惑主要源自水母的名字jellyfish， 以及水母也生活在水裡的習性， 但是實際上， 水母和魚的相似之處也僅限於此。