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居住在海洋里500米到几米千深处的动物,叫做深水动物。它又可以分为两个动物区系。生活在从500米到2,000米深的海水里的,是次深海区动物区系;从2,000米的深度再往下,属於深海区动物区系。深水动物的形态虽然是多种多样的,但是它们都具有许多构造上的共同的特征。由於不利的生活条件,深水动物,不论是在量的方面或质的方面,都不及高水位的动物发达。在深水动物里占统治地位的,首先是棘皮动物,然後是甲壳类和一部分鱼类。在三十年代,美国的研究工作者皮皮曾经用钢制的密闭小室——潜水球——沉入贝缪德群岛海上923米深处对深水动物进行过直接的观察。利用捕捉器和不大的曳纲用钢索从船上放下海里去,就可以捕获深水动物。1949年苏联生物
Animals that live in the ocean from 500 meters to several meters deep are called deep-water animals. It can also be divided into two fauna. Living in the sea from 500 meters to 2,000 meters deep is the fauna of the deep-sea area; from a depth of 2,000 meters further down, it belongs to the fauna of the deep-sea area. Although the forms of deepwater animals are diverse, they all have many structural common features. Due to unfavorable living conditions, deep-water animals, whether in terms of quantity or quality, are less developed than high-water animals. In dominating deep-water animals, the first is echinoderms, then crustaceans and some fish. In the 1930s, Pimpi, a researcher in the United States, once used a closed steel cell - a diving ball - to sink deep into the Peyrud Islands Sea at a depth of 923 meters for direct observation of deep-water animals. The deepwater animals can be captured by using a catcher and a small trolling wire to drop off the boat from the sea. Soviet Union in 1949