5. Conclusions
The non-native fish species composition in eight rivers of South China
is clearly related to their introduction use, which correlates to their
biological characteristics, particularly their ecological trophic
position and compatibility with their native habitat. The predacious and
omnivorous non-native fish species used in aquaculture are able to
successfully survive in South China’s rivers, especially those species
native to tropical regions. Geographical isolation and temperature
affected the non-native fish species composition, numbers of species,
and dominant species in the region, and these two factors probably most
influence the differences in their distributions.