伊犁河是新疆最大的一条河流。伊犁河流出国境后，进人哈萨克斯坦共和国最终汇入巴尔喀什湖。特殊的地理位置使伊犁河流域鱼类群落结构具有独特的空间格局。伊犁河流域栖息着原始等级和特化等级的裂腹鱼类：银色裂腹鱼、伊犁裂腹鱼、斑重唇鱼和新疆裸重唇鱼，亦是我国西北地区淡水鱼类良种选育的重要基地之一。近些年来，伊犁河土著鱼类资源衰退，数量下降。其中，外来鱼类的移植是引起土著鱼类资源下降的重要原因之一。利用生态位模型对伊犁河外来鱼类的分布区进行预测，分析其适生性，是合理制定资源保护措施的必要前提。本研究拟对伊犁河流域（中国境内）的鱼类群落结构变化进行分析，查明引起群落结构特征和种类组成变化的外来鱼类，对外来鱼类的分布区进行预测，分析外来鱼类的适生性，探讨外来鱼类对土著鱼类的影响，促进数学模型在鱼类生态学与保护生物学中的应用。

Ili River is the largest river in Xinjiang. The lower reaches of Ili River flows into the Kazakhstan Republic, eventually emptying into Balkhashi Lake.The Ili-Balkhash region has a very special composition of fish fauna with primordia-grade and specialized-grade Schizothoracinae species: Schizothorax argentatus Kessler, Schizothorax pseudaksaiensis Herzenstein, Diptychus maculatus Steindachner and Gymnodiptychus Dybowskii (Kessler). Otherwise, it is one of the most important base of freshwater fish selective breeding. In recent years, native fishery resources of Ili River were on the decline. One of the important reasons for the declining of native fishery resources was introducing fish species from abroad. Prediction the potential distribution and habitat suitability analysis of the alien fishes will give hints for native fish resources conservation. In this study, fish investigation will be conducted in the Ili River, China, aims to ascertain the alien fishes caused the variation of community structure, then prediction the potential distribution and analysis the habitat suitability of alien fishes, explore the impact of alien fishes on native fishes and promote the application of modeling method on fish ecology and conservation biology.