orders and eight families of fishes from the Paraná and Uruguay rivers in Argentina:
Acestrorhynchus pantaneiro, Cynopotamus argenteus, Pachyurus bonariensis, Pterodoras
granulosus, Hypostomus commersoni, Pseudoplatystoma corruscans, Pimelodus
maculatus, Parapimelodus valenciennis, Salminus brasiliensis, Prochilodus lineatus,
Hoplias malabaricus and Leporinus obtusidens. For the last four species, the length at first …