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Abstract
During a period of high water level, samples of Zooplankton from the main course of Paraná river, side‐arms and tributaries were obtained (25 sampling stations). The main course, characterized by high discharge and current velocity of water, showed a small number of species, most of them planktonic, and a low abundance of organisms (X: 10 720 ind m3). The side‐arms and tributaries showed lower discharge and current velocity, together with both a higher number of species and abundance (X: 15 190 and 320 435 ind m3, respectively).
In the tributaries, with their high concentrations of salts, a particular faunistic composition was registered.
The similarities among these environments were calculated and the data of this study are compared with the other study carried out during a mean water level.
