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搜了些资料,自己挑选一下吧.http://国家地理杂志的楼主你够能偷懒的了........关于食物的,给你挑了一段:Jellyfish may appear to have no apparent value, but they are, in fact, a very important part of the marine food web. Jellyfish are carnivorous, feeding mostly on a variety of zooplankton, comb jellies and occasionally other jellyfish. Larger species, however, are capable of capturing and devouring large crustaceans and other marine organisms. Jellyfish themselves are preyed upon by spadefish, sunfish, loggerhead turtles and other marine organisms. One species, the mushroom jelly, is even considered a delicacy by humans. Both fresh and pickled mushroom jellyfish are consumed in large quantities in China and Japan.
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There are about two hundred kinds of jellyfish found in the world. Jellyfish consist of swimming bell fringed by tentacles, with a four-cornered mouth on the underside. Around the mouth are four trailing arms which, like the tentacles, are well supplied with stinging cells. Jellfish swim by contracting and releasing a ring of muscle cells.
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双语资料供参考：jellyfishAny of about 200 described species of free-swimming marine cnidarians (in the classes Scyphozoa and Cubozoa), many of which have a bell-shaped body.The term is also frequently applied to other similar cnidarians (e.g., Portuguese man-of-war) and some unrelated forms (e.g., ctenophores and salps). In scyphozoan jellyfish, the free-swimming medusa form is the dominant stage, with the sessile polyp form found only during larval development. Jellyfish live in all oceans and include the familiar disk-shaped animals that are often found drifting along the shoreline. Most species are 1–16 in. (2–40 cm) in diameter; some are 6 ft (1.8 m) in diameter, with tentacles more than 100 feet (30 m) long. Though some jellyfish simply filter-feed, most feed on small animals (e.g., crustaceans) that they catch in their tentacles, whose stinging cells immobilize the prey; contact can be irritating and sometimes dangerous to humans. The cubozoan jellyfish comprise 50 species of box jellies (the rather spherical body is squared off at the edges), which are usually 1–2 in. (2–4 cm) in diameter. 水母 [jellyfish]无脊椎动物 水母纲和立方水母纲海洋刺胞动物，已知约有200种，许多种呈钟形。此词通常也指其他类似的刺胞动物(如僧帽水母)和无亲缘关节的种类(如栉水母和海樽)。在钵水母纲的水母种类中，自由游泳的水母型形式是主要的形态，固着的水螅体形式只出现于幼虫发育时期。自由游泳的水母见于各海洋，包括常见的沿海岸线漂流的盘形动物(如甲壳动物)。直径一般2～40厘米，但有的直径可达1.8米。多以具刺丝胞的触手捕食小动物，触手上的刺丝胞使猎物麻痹；有的种类则滤食水中的微型动植物(如甲壳类动物)。人类触及刺丝胞后局部会发炎，有时很危险。立方水母纲的水母约有50种。球形，但边呈方形，故俗称箱水母。直径约2～4厘米。
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