摘  要：本实验通过实验室饲喂称重的方法探究外来物种尼罗罗非鱼和本地物种鲫鱼之间的空间竞争。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尼罗罗非鱼和鲫鱼的影响。实验表明尼罗罗非鱼与鲫鱼在不同配比的混养情况下，体重都表现为降低，其中尼罗罗非鱼的体重下降更多，但都有正增长的趋势。综合来看，尼罗罗非鱼与鲫鱼之间存在空间竞争关系，且鲫鱼表现出较强的竞争优势。

关键词：外来物种；尼罗罗非鱼；鲫鱼；空间竞争

Abstract：This experiment is conducted to competition for space between the alien species Tilapia nilotica and local species Carassius auratus, loach by the way of feeding-weighting. In order to study the biological diversity and ecological environment distruction from foreign species, this research introduced space resourses as competition condition to observate biology and ecology properies and compare the differences of environmental adaptation. This study presents the effect of space competition and interspecies competition on Tilapia nilotica and Carassius auratus. Experiments show that Tilapia nilotica with Carassius auratus in different proportion of any circumstances, to reduce weight, including Tilapia nilotica of weight drops more than Carassius auratus, but all have positive growth trend. Comprehensive to see,between Tilapia nilotica and Carassius auratus present competitive relationship, and Carassius auratus show stronger competitive advantage.

Key words: alien species ;Tilapia nilotica ;Carassius auratus ;competition for space