| 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. |
