a carp attempts to swim up a dam wall in a shallow flow of water.

nature freshwater shallow persistent swimsuits attempts adaptable australia carp concrete conservation cyprinus carpio dam wall darling river desperate determined ecological damage ecologically effort environment fins fish flow flowing foam fresh water gills habitat heading invasive invasive pest lake pamamaroo menindee menindee system south wales natural predators omnivorous pollutant tolerant scales slope species stream swimming tourism tourist attraction travel turbidity versatile water