摘要：本实验通过实验室饲喂称重的方法探究外来物种琵琶鼠鱼与土著物种黄颡鱼、鲫鱼混养利弊关系，以空间资源为竞争条件，应用其生物学和生态学特征以及环境适应性的差异, 研究入侵物种对生物多样性和生态环境的破坏。从而得到空间关系与种间斗争对琵琶鼠鱼与黄颡鱼、鲫鱼的影响。

通过实验数据的处理以及实验过程的观察，可知琵琶鼠鱼与黄颡鱼在混养情况下存在一定的空间竞争，黄颡鱼的竞争力要稍胜一筹。从实验的趋势上来看，掌握好两种鱼的配比，能有效的控制琵琶鼠鱼的生长，而不影响黄颡鱼的生长。鲫鱼与琵琶鼠鱼在一起饲养的情况下，鲫鱼和琵琶鼠鱼相互影响彼此的生长状态，使两者的生长情况呈线性相关。外来物种琵琶鼠鱼的入侵对土著物种鲫鱼的生长不利。

关键词：外来物种，琵琶鼠鱼，鲫鱼，黄颡鱼，混养

Abstract：Experimental laboratory feeding weighing method to explore the fish with indigenousspecies of alien species Pterygoplichthys multiradiatus Pelteobagrus fulvidraco, carp polyculture pros and cons of the relationship between space resources for the conditions of competition, theapplication of biological and ecological characteristics, and environmentaladaptabilitydifferences of invasive species on biodiversity and the ecological environment destruction. Thus the impact of spatial relationships and the strugglebetween species of the lute rat fish, crucian carp,. Experimental data processing and experimental observation of the process, we can see that the The  Pterygoplichthys multiradiatus and Pelteobagrus fulvidraco in polyculture case a certain degree of spatial competition, the competitiveness of the crucian carp to be slightly better. From the trend of the experimental point of view, to grasp the ratio of the two species, and can effectively control the growth of the lute rat fish, not affect the growth of crucian carp. Case carp lute rat fish reared together, the crucian carp and  Pterygoplichthys multiradiatus mutually influence each other's growth status, so that the growth of the two was a linear correlation. Invasion of alien species  Pterygoplichthys multiradiatus unfavorable to the growth of indigenous species of crucian carp.

Keywords：Alien species;Pterygoplichthys multiradiatus; crucian carp;Pelteobagrus fulvidraco ;lyculture