外来物种琵琶鼠鱼与土著物种黄颡鱼混养的利弊研究

通过对琵琶鼠鱼与黄颡鱼混养利弊关系的研究，探究外来物种与本土物种混养时的利弊关系，为我国对外来物种的引入提供参考。通过实验室饲喂称重法，对琵琶鼠鱼与黄颡鱼的生长和竞争等进行跟踪监测，并应用数据分析系统软件对测量结果进行分析。结果表明，土著鱼种黄颡鱼对新环境的适应性和稳定性要强于琵琶鼠鱼，黄颡鱼的生长与琵琶鼠鱼的存在及数量多少的相关性不大，与其自身的密度有一定的关系；黄颡鱼数量增多并没有表现出共同御敌的现象，反而增大了种内竞争，使平均增长率呈现较大的波动性。琵琶鼠鱼的存在对土著鱼种黄颡鱼的影响并非预想的大，但其很强的适应性，在试验后期各组均有表现，出现正增长趋势，不能排除长期适应生活环境后，其竞争性会增强。

Study on advantages and disadvantages between alien species Pterygoplichthys multiradiatus and indigenous species Pelteobagrus fulvidraco Richardson

The alien fish species Pterygoplichthys multiradiatus and local fish species Pelteobagrus fulvidraco Richardson were polycultured in order to test the interaction of alien and local species and to accumulate the data of intentional introduction species in China.The fishes were raised in laboratory and weighed to reveal the situation of growth and interspecific competition. Statistics software was used to analyze the measure results. The results showed that, the adaptability to new environment of local fish P. fulvidraco was better than that of alien fish P. multiradiatus; the growth of P. fulvidraco had no correlation with the quantity of P. multiradiatus, nevertheless, had a negative correlation with the density of itself, resulting from the intraspecific competition; different from early supposition, the existence of P.multiradiatus had no obvious influence on the growth of P. fulvidraco, moreover, considering the positive growth trend in later experiment period, we could not remove the probability that the competition ability of P. multiradiatus would increase after adapt to local environment.