游泳动物(Nekton)是水生生物的一个生态类群,是指能在水层中自由选择其行动途径的水生动物的总称。研究游泳动物发生与发展的一般特性的分支学科为游泳动物学(Nektonology)。 游泳动物和浮游动物与底栖动物相比较,种类组成较为简单,但个体巨大并有明显的结群习性,多数(?) Nekton is an ecological group of aquatic organisms and refers to the general term for aquatic animals that can freely choose their route of action in the water layer. A branch of the discipline that studies the general characteristics of the occurrence and development of swimming animals is Nektonology. Swimming animals and zooplankton compared with zoobenthos, the species composition is relatively simple, but the individual is huge and has obvious habit of cluster, the majority (?)