水母又叫果冻鱼，两三年前台湾紧随日本饲养水母的风气掀起一阵饲养高潮，无论在街上、夜市、百货公司到处看到贩卖一种透明的、有规律上下律动的水生动物－水母。
水母属於腔肠动物门、钵水母纲，乍见好像非常脆弱，可是这种生物出现在地球上已经超过十亿年了！它的特殊繁殖方法可能是到现在仍能继续生存的最大原因吧。
水母属於雌雄异体，生活中有典型的有性／无性生殖世代交替，即附著期的水螅型及漂浮期的水母型，水母期有雌雄之分，行产卵有性生殖，经过幼生期后进入形状与生活形式完全与水母期相异的水螅期，水螅期行出芽无性生殖而数量快速增加，成长变成水母型水母在幼生期祗要性成熟即可行有性生殖而产生受精卵，孵出后定著於盘附物而成水螅型，此二型交互替代的特殊生存方式。
水母的繁殖基本上准备一个专用水槽，采底沙过滤，温度控制约在18℃－25℃，比重在1.023－1.025，每日光照大约 8－10小时，每周约略换一次水。水槽置入采集到状况良好的水母水螅体，水螅长2-3mm、触手16只、体色一般是乳白色。每日餵饵一回，用吸管充分将刚孵化的丰年虾或轮虫直接吹在水螅触手上，3周左右水螅会变白化，看起来好像状况变差，实际此时正是水螅期完成准备进入水母期的状态。
其后分裂出芽复制至10数只，颜色转为褐色，成熟后从前端开始一只只水母幼体游离出来。最后残留的足盘3个月后会再回复原本水螅体状态。水螅期和水母期可用轮虫或丰年虾幼虫、鱼贝肉汁、JM浮游生物(粉状)、VG微生物滋养剂、NEW AMINO新胺基酸软体饲料等作为营养铒料来源。大型水母则以糠虾或稚鱼投餵，如此才不致於营养不足而愈养愈小了。
水母是一种低等的腔肠动物，在分类学上隶属腔肠动物门、钵水母纲。水母身体外形像一把透明伞，伞状体直径有大有小，大水母的伞状体直径可达2米。从伞状体边缘长出一些须状条带，这种条带叫触手，触手有的可长达20米～30米，相当于一条大鲸的长度。
水母，是海洋中重要的大型浮游生物。水母寿命很短，平均只有数个月的生命。水母是无脊椎动物，属于腔肠动物门中的一员。全世界的海洋中有超过两百种的水母，它们分布于全球各地的水域里。
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