Distribution records of native and exotic fishes in pacific drainages of Northern Mexico

" Previously unpublished distribution records of native and exotic freshwater fishes from Pacific drainages of Mexico are reported, based on collections made in 1980 and 1981. Some cyprinids and catostomids extend further south than previously reported. Gila purpurea is reported from the Río Concepcion drainage. Numerous exotics have apparently become established with undocumented impacts on native fish populations "